Just one reason why I shoot 4/3'rds.....

The ones that don't fit proper allowing dust to get in (or more importantly and this happens with any system, a lens that just doesn't sit right for the intended use - ergo changing them all the time till happy and letting dust in)

I have no knowledge on any other system other than Oly so I won't make rank suppositions, just sideways glances.

Thane

--
The digital image is a dozen or so words
positioned carefully to paint a picture
that challenges the eye
and tricks the mind
into thinking, light is a title
and the palette a taste bud
worth tasting.