Welcome to probably the least likely camera comparison on the entire Internet. But these are the two good-quality digital cameras that I own. So I’m comparing them.
I’ve loved my compact Canon PowerShot S95 from the moment I got it. It’s so small and capable. But I’m not impressed with the JPEGs the camera generates. So I shoot RAW all the time and use Photoshop to do a handful of adjustments that give the results I want.
I’ve yet to fully figure out my large, heavy Pentax K10D DSLR, but I do respect that it can use all of my manual-focus Pentax lenses. For this comparison I used my 28-80mm f/3.5-4.7 SMC PENTAX-FA lens, which offers a zoom range close enough to the S95’s 28-105mm (35mm film equivalent) range to make the comparison useful.
For the comparison I set both cameras to set white balance automatically. I meant to set both cameras for automatic ISO selection as well, but it looks like I inadvertently left the K10D set at ISO 400. All other settings were whatever they happened to be, which is essentially camera default.
I’ve written several times how I wish the S95 returned usable in-camera JPEGs. The photo below might be the first time I’ve shown you a JPEG straight from the camera. This photo shows both common S95 faults: how white balance runs cold, and muted colors (typical of all Canon digital cameras, I hear).

Here’s what this photo looks like after one minute of work in the Photoshop RAW processor. First I manually adjust color temperature until I’m satisfied. Then I click “Auto” above all the basic settings (exposure, contrast, etc.) and then tweak them. I finally use the built-in lens profile to correct distortion, because the S95 doesn’t go far enough to correct it in camera.

In contrast, the K10D gave me usable in-camera JPEGs in every shot.

A tiny bit of work in the Photoshop RAW editor brought out what is, to my eye, more natural warmth and color, and helped un-wash-out the sky. All I did was tweak the basic settings a tiny bit.

From here on out I’ll show just the RAW-processed photos. At this cemetery gate, the S95 struggled to navigate the shadows, and I had to bring out the details in Photoshop.

The Pentax K10D handled the shadows much better.

I was surprised and disappointed by this photo from the S95. This is exactly the kind of scene I’ve shot over and over using this camera, with lovely results. I couldn’t Photoshop this one credibly to the level of warmth I saw at the scene.

The K10D nailed it.

Maybe the S95 was having an off day. Maybe comparing it to the K10D with its larger sensor makes the S95’s performance just seem worse than usual. Maybe my eyes see more keenly now than in 2010, when I got my S95 and it impressed me so. Maybe the camera really does perform worse now than when it was new — although I can’t imagine how that is physically possible.

Whatever: the K10D blew the S95 away in most of these photos, in that the K10D’s photos are simply more appealing. And the K10D is even older than the S95, having been released in 2006.

One place where the S95 did edge out the K10D was in focusing close. I should have put the camera into macro mode — it’s not hard to do, and it would have let the camera focus on the C. But even in regular mode it focused on the E immediately with a cheerful bee-beep and I made the shot.

In contrast, the K10D would simply not focus on anything in this frame. That 28-80 lens hunted like mad. So I turned on manual focus with a single lever flip and brought that C in sharp with the lens’s focus ring. The S95 has a manual-focus mode, too, by the way. But it involves using the tiny wheel on the back of the camera to focus, and you have to trust your eyes reading that 3-inch screen to know when you’ve focused correctly.

This is the only pair of photos where it’s hard to tell which camera I used. First the S95.

Now the K10D. On the in-camera JPEGs, the church’s doors were lost in the shadows. Photoshop fixed that easily in both RAW images.

I have really loved my Canon S95. It is so tiny yet has returned wonderful images for years. Over the last few years I’ve been shooting it RAW+JPEG, which coincided with the time my satisfaction with the in-camera JPEGs trailed off. I think I’ve figured it out: lots of in-camera JPEG-optimizing settings are unavailable the minute you turn on RAW. I think the camera assumes you’re going to post-process and don’t therefore need the in-camera boosts. Well, I want those enhancers and the RAW file. I guess I’m out of luck. But I’m growing weary of all the post processing. I’m ready for a camera that delivers good-enough JPEGs at the second I touch the shutter button.
The Pentax K10D delivers usable in-camera JPEGs. But it slips into no pocket in any coat I own. Slung over my shoulder I am keenly aware of it at all times — it might be the heaviest camera I own, heavier than my wonderful Nikon F2AS. And I haven’t found the right lens for it yet. The 28-80 I used here tends to a little chromatic aberration and too frequently blurs the foreground in long shots. My 35/2 delivers good work, but I shoot it in manual-focus mode most of the time because the K10D focuses it accurately only 1 or 2 out of 10 times.
Because do a lot of documentary work, such as on my road trips, I really want a camera that slips into my pants pocket, offers a zoom range starting with at least 24 or 28mm and running to at least 85mm, does credible close work, and yields usable JPEGs. The S95 ticks all but the last of those boxes.