Originally posted by starbase218 OTOH the differences in size and weight between a K-1 with a 24-70/4 and a K-3 with a 16-50/2.8 would be smaller, if that 24-70/4 existed. This is arguably a more "equivalent" setup in terms of capabilities. The lenses would probably be about the same size/weight. The K-1 is still quite a bit heavier than the K-3, but there are fullframe DSLRs out there that are actually lighter than the K-3. So I think you could get yourself a fullframe setup with f/4 lenses, enjoy the fullframe advantages, and still have about the same weight to carry around. (currently, this is not the case with Pentax though)
Sort of, sort of not.
The 24-70 F4 is still F4 and lets F4 amount of light in. The 16-50 is still F2.8 and lets 2.8 amount of light in.
The depth of field difference is less than 2 inches at 10 feet at F2.8 vs F4. If that matters at all. (APS-c can't touch Canon's 85mm 1.2 on FF, but then I don't see a lot of people around here shooting a Canon 85mm f1.2...)
I'll take a 16-50 DA* over a 24-70 F4 Canon L all day long. And as a matter of fact, my video comparing the Canon 6D FF with 24-70L F4 vs the K3II with Tamron 17-50mm F2.8 photographing a 1 shot 4 foot pano print is all about why I choose the APS-c for smaller cheaper, faster and better IQ...
I always hear a lot of talk about this and that but very few examples of photos that demonstrate all these theoretical advantages. And I know why.
---------- Post added 07-06-16 at 03:52 PM ----------
True that!
Lets hope they still have the lens engineers to get things going. So far they have trickled out about 1 new lens a year.
(Not counting those made by other manufacturers with a Pentax name badge.)