Originally posted by lightedlamb I do find my K5 to have issues with sharpness just recently.. but it could be my lenses.. I am looking to have better resolution and sometimes feel constrained by the crop sensor.
So, first things first, are you absolutely sure that AF fine adjustment is set accurately for each of your lenses? At close range and/or wider apertures (especially both together), any inaccuracy in AF could make a big difference to how sharp things look at the point of focus - though I have to say, difficult though it may be to judge at this size of reproduction, your photos look very sharp and detailed.
That aside, the extra resolution and lack of a physical AA filter on the K-3 & K-3II can make a very noticeable difference in certain areas, particularly on very fine details such as hair, eye-lashes etc. In many cases, though, careful RAW "pre-sharpening" of your K-5 images in post-processing can give results that are very, very close to the K-3 & K-3II in a great number of situations - so before you look to upgrade for the sake of perceived sharpness, I would make sure you've exhausted the possibilities, tools and your own skills in applying sharpening.
Originally posted by lightedlamb not sure if I want the full frame Pentax just yet. Not sure about the ff lense selection
I have some non-Pentax full-frame equipment, and I enjoy shooting with it very much, but I chose to stick with APS-C for my Pentax gear - and the K-3 remains my main go-to camera. I get the results I want from it (and the K-mount lenses I own), so there's really no sense in me moving to Pentax FF right now. That said, there is a significant improvement in very fine detail and high ISO performance between the K-3 / K-3II and the K-1.
As for FF lenses... Ricoh has the main bases covered in terms of high quality zooms. They're not cheap, but feedback from users suggests they're good. Plus, the existing FA Limited lenses are undeniably excellent (and remain hugely popular for that reason), whilst the FA50/1.4 and FA35/2 are both excellent and *slightly* more accessible price-wise. There'll be new lenses coming over the next year or two as well, but I'd say the K-1 is already better catered for than you might think.