Originally posted by Edgar_in_Indy Here's a picture I put together and posted a while back when discussing the merits of more megapixels. For anybody shooting in the studio, more resolution is always a good thing. And as the image below demonstrates, the extra pixels in the new 24MP Sony APS-C sensor are not just empty pixels. There is a real and significant increase in resolution/detail.
Pay particular attention to the words "Pure Brewed", and how the white spaces between the horizontal black lines are rendered. Also look at the seal, and the tiny text above and below it, and how it becomes much more legible as the megapixels increase.
And here's the full image Imaging Resource test-shot that the crops were taken from:
Can't really see anything because we're at screen resolution and obviously the bigger picture will be clearer. DPreview have a nice comparison gadget on their reviews. If you want to see that 'white space between lines' look at the coin at JPG 100 (extra sharpness)on the K5 which really leaps out at you! Pixel peeping on their site is interesting because the Pentax reviews consistently look softer in RAW than cameras using the same sensor (for the K5 read Nex-5, Nikon 5000 etc) and that's got to be down to the lens they use for the Pentax, a 50mm 2.8 - either it's not a good example of the lens or DPR are fiddling the result... Either way the lens looks to be the limit.
On their 'coin' and looking back to back with the new 24 mpx sensor, yes there is marginally more definition, but better to compare the Nex-5 with the Nex-7 where they use the same lens. Not so clear a difference is there? - a tiny bit clearer, but it's marginal. What isn't marginal is the 1 - 2 stop lead in ISO performance the smaller sensor has.
From what I can see even with the camera bolted to the bench, mirror locked up and optimum aperture the advantage of the 24 mpx is marginal to say the least, and I'd bet that with any zoom, hand-held it'd be zero. On the other hand noise differences are clearly visible as are the dobbin' great files produced...
Personally, for the photography I do, I doubt I'll never hit the stops that 16 mpx gives.
Incidentally, I remember some mag doing such a test with 3 sony SLR's a while back - a 10, 12 and 14 mpx. The 12 showed a tiny improvement in resolution over the 10. The 14 didn't because the lens was the limit. The 10 had the best low-noise performance. Overall the 'best' was a toss-up between the 10 and 12 with the 14 some way behind.
Now if they could use the 24, but also an option to set it as a 12 mpx with the sensors doubled for increased dynamic range a la Fuji there might be some sense to it...