Thanks Bill. I am about to pull the trigger on a GH4. With prices being as they are it is good to realize my past investment into the lenses was not in vain. At some point I will catch up to auto focus lenses.
I've found it quite intriguing (coming from a portrait stills pro background) how when digital first replaced film, we HAD to get new lenses optimized for digital cameras, and it did make a big difference in still camera images at that time. But that was SO last decade ...
Now, say, my D3 works quite well with my older Nikon lenses. And in video ... a LOT of people rave about using older Nikon, Pentax, and Minolta lenses for their smooth, not-looking-like-taped-video look. I've found that my old Nikon 50mm 1.2 and an 80 1.7 work beautifully on my GH3. And ... I've got an even older Minolta 80mm same that I've seen used by a few people on GH2/3/4, and wow ... I think I need to get a Minolta-to-M4/3 adapter also.
They don't cost a lot, just make sure you get one the exact depth so you can focus properly. My first one couldn't focus past 15 feet with the lens wide-open!