Originally posted by Nicolas06 Exactly, that the lenses.
Canon has few small lenses but there at least some choice in medium lenses. Nikon is a bit better on that topic. Sony A7 echosystem is worst there with 1 small f/2.8 lense and that all. A7 echosystem is the least viable for this. Maybe they need a few years to have some more interresting lenses.
Pentax counting only FF lenses has 35, 43, 50, 77 lenses that are quite small and very nice. FA31 and DFA100 are too medium sized lenses. Would they dare to add a 24mm and the offering would be complete and quite interresting on standard range prime area.
That really on the zoom range that there officially nothing available (small or big). I would think that the rumored 70-200 will be everything but small.
I would add for Sony I looked at the highend transtandard lens from Zeiss review in photozone. I was expecting something really nice as everybody know mirorless should be easier to work with with shorter registration distances, the Zeiss name, the high price and finally moderate max apperture (f/4).
This is funny how photozone reviewed it as just average (2.5) and find weak borders, huge distorsions (>3%), more than 2 stops of vigneting but also very bad bokeh. Photozone also explained how mirrorless made design of lense not that easy.
The more I look at it, the more I think the A7 is mostly hype. I could pass on the so called weak borders. But more than 2EV of vigneting for an f/4 when one of your body is supposed to be a low light king and the bad bokeh for a FF system that many choose for the additionnal deph of field control... This is not very good news.
Thus, even through we are accustomed to Sony under designed lens in E mount (Nex lenses were terrible) and that may not be an indication at all of other mirrorless FF that might come in the future, I'am not sure it would that a good idea for Pentax to make it mirrorless. Apparently there more problems here than one could think naively. The lenses are not even that small neither, I mean FA ltd are smaller !
I would then prefer a compact FF DSLR design that would perfectly go with the FF lenses Pentax already have! As some said here the body doesn't need to be bigger than K3 or heavier. And please if you make dedicated FF zooms lenses, I don't care to have perfect borders, I mean even the sigma advocate recognise the lastest Nikon 58 with bad tests chart is a very nice lens... But please make sure the bokeh and rendering are nice ! This is important !