Originally posted by drugoz those are the only pictures that aren't mine!!... they are taken with a canon 7d. I tried playing with that camera while the photographer was there and the feeling was that the noise managing was way better than the k-01...hence this post.
If you take a close look at those 7D pictures, they are actually pretty noisy! This makes sense really, Canon sensors have fallen behind their Sony equivalents when it comes to high ISO performance. It helps that the Sony sensor used in the K-01 (and K-5) was considered to have good noise handling at higher ISOs.
So, what is it about those pictures that makes them good? Well, for a start the photographer removed the nastier, but easier to remove colour noise. Software these days easily handles colour noise, and you really need to ratchet it up for it to start having a real effect on the scene colours. The luminance noise in those photos shows that noise was high, so colour noise had to have been removed in post. Luminance noise is hard to remove without softening/smudging the picture, especially when there is lots of it. Good post processing will dramatically improve photos taken at 1600, 3200, even 6400 ISO without ruining the colours of the scene itself. Of course, those higher ISOs do have an impact, so only go up if you have to, but a bit of work will result in usable web-sized pictures. If you like pixel peeping, higher ISOs will never produce good enough pictures, no matter the body.
The other thing is that the photographer has used the scene to distract from the IQ impact the noise has. They are not cataloging an artwork, they are recording the visit of a group of people who are viewing the artwork. By capturing people naturally responding to the art and ensuring the art is at an oblique angle your eye naturally surveys the scene of the picture, rather then honing in on details of the art - very effective. If you take the scene out, by zooming in on the art away from the people, suddenly the flaws stand out. Try this with the 8th picture, expand it and concentrate on the top-centre of the image, and suddenly the IQ degradation on the silhouette of the leaves by the noise becomes really obvious.
I think your K-01 can deliver results as good as a 7D (presuming this is a mkii, the 2009 original would be left in the dust), you need to focus on maximising you post processing and the composition of the photo. A brand new body will give you an improvement, but not enough to remove the issues. Noise will be a little less, but it still needs to be dealt with.