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I got a PM regarding the Pentax K24/2.8, but as I have less than 25 posts on the forums, I can't reply to the PM, so I'm dropping my reply here for now.
The K24/2.8 is pretty good.
IMHO, the lens characteristic is like this :
Center is very sharp from wide open.
Get very good by f4 and at f4-f5.6 its generally sharp for the whole frame.
I will not hesitate to use it for most detail shots (eg. wood/cloth texture shots ) if I don't have the luxury of going f8 due to lower light levels.
At f8, f11, center is very sharp, but perhaps 1/3 out of the center there is some drop in sharpness, then this holds on till the last 1/8 of the frame towards the edges and corners, where its noticeably softer.
But don't get me wrong when I say softer on the 1/3 off the centre.
IMO, its not very obvious in most shots and not too much to worry about.
AFAIK, almost all the 24/2.8 legacy lenses have similar characteristics. (+/- a bit)
I use it not only because I already have the lens, but its also a good balance of size and performance.
Make more sense on the A7 as a small system.
I have seen a comparison that seems to show that the FD24/2.8 is sharper.
So you may want to look at that too.
I have only compared the K24 to the FD20 which I have.
The FD20 was impressive to match up on the sides to the K24 in sharpness (and it was 20mm not 24mm), but it clearly lost out in micro contrast.
Hope the info helps.