actually, its the glass that oly *shines* at (grin)
people seem to buy 4/3 bodies *because* of wanting to get into the oly glass system.
4/3 is not dead. its not that much noisier or even smaller than aps-c.
in fact, oly is much much larger in europe than the US. must have to do with brand recognition and marketing (figures..)
what in N or C land can equate to the 'outdated' e3? who has live view, flip lcd, FULL sealing/protection? a guy on another forum I visit has both the nikon d3 ($5k) and the oly e3 ($1.5k) system. he regularly switches between them. they are equivalent to me, except for some rare shots where the d3 is needed for super super high dyn range or high iso. other than that, you NEED to step up to $5k d3 to 'beat' the lowly e3.
same kind of deal in the canon camp. you have to buy their top models (not even mid-grade, really, for them) to beat what oly has.
if you want value, then I'd suggest pentax. they are not quite up to oly body strength and sealing but they are great *values* and still offer more for the money than N or C does.
I keep coming back to it - N and C are fine as long as you are ok with spending a lot. if that's ok, then go N or C and you'll be with the rest of the pros. but go into it knowing that N and C will require serious spending and if you dare go full-frame, the lens prices are outrageous (but required to get to the FF level).
I actually had a lot of legacy nikon glass from my 35mm film days but I chose to not get back into nikon for various reasons and I still don't regret it.
one huge diff in the N/C vs 'the rest' is that the rest don't have history in OIS (opto image stab.). this is the 'pay again and again' camp where you rebuy the same stab. tech and have it be present in each and every lens you buy.
the opposite camp (sony, pentax, oly) is to have a 'sensor shaker' where the IS is inside the body (IBIS) and each and EVERY lens (even very old manual ones) get the multistop advantage of IS. I really liked the economy of that.
people who buy N or C find that they have to spend x% more on each lens to have that OIS stuff built in. on the plus side, OIS helps aim the camera and keep it framed better thru the finder. IBIS does not help with the finder - only the picture taking part (sensor).
buying an IS mech. once makes sense to me. that was one reason I had to rule out N and C.