>>4296554Well 4/3s can technically be smaller, there are some tiny bodies and lens combos you can use and once you get out to really long lenses something like a 400mm is obviously going to be way smaller than nearly any 800mm you can get. Although you need to take into account the difference in aperture equivalence. Most of those 800mm lenses are going to be like f/5.6 and way faster than any 400mm you'd get for 4/3s (although Canon now make a 600 and 800 at f/11 which is fairly small). And the same applies to shorter lenses, compare a 50mm f/1.8 on FF to a 25mm f/1.8 on 4/3s and yeah the latter is going to be a little smaller, but the 25mm f/1.2 is a fair bit larger and I don't even know if that would be equivalent.
And then there is of course the actual size of most of the recent 4/3s bodies that Olympus and Panny have been bringing out, they as big or bigger than the FF ones.
