However until somebody makes a 400mm prime tele for m4/3 I am stuck with some form of legacy glass. I haven't bought one yet but I will. Wildlife photography is pretty much my fave activity.

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EP-3, EM-5, 12/50, 12mm, 17mm, 14/42mm, 40/150, 75/300, Nikon 400mm f/3.5 AIS IF ED, HLD6, FL 600R

Different strokes for different folks, I guess. But also, as has been mentioned already, not all legacy glass is that big. My Industar 61 L/D 55mm is smaller than either the m. Zuiko 45mm or the OM Zuiko 50 f1.8 on the adapter, and the latter set is only about as big as the native m4/3 PL 25mm. My 1946 Elmar 90mm is smaller than anything else in that focal length that I've seen -- it's sharp enough, and (most importantly) is fun to shoot. An uncoated 1932 Elmar 50mm doesn't do that good a job on the m4/3 bodies, but putting it on an EP2 and shooting with it was a gas. And it looked great on the camera. Sometimes it's just playing with what you have around, and IMHO playing with the craft is essential.

It's not just the legacy glass. Old bellows accessories etc. attached via adapters add a cheap extra dimension that is great fun to play with. m43 is also far better suited for attachment to microscopes (and presumably telescopes) than other systems. I think it is the versatility that many of us like.

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http://xray.uky.edu/people/parkin.html

As long as you don't criticize with saying "big, heavy, DSLR users" in one breath and then in the other, slap on a huge legacy full frame or SLR lens....then you're fine!

It's mostly for the fun of it (and because I could). I do love having a manual aperture ring. As for the weight - sticking with the lighter lenses means it is not too bad. Although for travelling the native lenses are the way to go.

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E-M5, E-PM1, Olympus Zuiko: 12/2, 45/1.8, OM Zuiko: 50-250/5, 135/3.5, 100/2.8, 85/2, 50/3.5, 35/2, 28/2, 24/2.8.Panasonic: 20/1.7.

Too right. No tiresome sniping at people who haven't made the same choices as you. One of the great things on this forum is that there is almost none of that. Some of the discussion groups on Flickr can get very nasty. There is no point. It is about what suits you and respecting other for what suits them.

What ever choice you make with MFT or otherwise, enjoy it.

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Panasonic G1 and GH2; 20mm f1.7; Leica Elmarit 45mm f2.8 Macro; Olympus 12mm f2; Nokton 50mm f1.1; Nokton 25mm f0.95; Samyang 7.5mm f3.5; Complete set of Pentax Auto 110 lenses and adaptor; large collection of Minolta MC/MD lenses and adaptor; various "toy" lenses.

I picked up my GF3 and the 20/1.7, 14/2.5 and 14-42pz for the small size and light weight. My GH's however, are mostly for video, and I'm still searching for a good legacy 600mm for my wildlife shooting. That's about as honking big as they get.