I'm looking to upgrade from my current cameras (two Panasonic G6's), but don't know what I want to do. I just rented a GH3 for a couple days, and really liked the ergonomics of the GH3 (it fit very well in my hand). I don't know if I should get a lightly used GH3 and GM1 (great for my small prime lenses), or just get a lightly used GH4. Advantages of the GH4 over the GH3/GM1 are: - DFD Focus (I tested the focus tracking of the GH3, and was pretty happy with how it performed with cars going about 40mph, but I like shooting motorsport events and I don't know how it would do where the cars are going much faster) - ISO 100 vs ISO 125 (I don't think the extra 1/3 stop would matter all that much) - Auto ISO in M mode - 1/8000 shutter vs 1/4000 - 7 FPS burst shooting with live view vs 4 FPS - 1/250 flash sync vs 1/160 - Higher resolution rear screen and EVF - Focus Peaking - ISO 3200 in silent mode vs ISO 1600 Looking at the financials, I could get the GH3/GM1 for about $1000, where a GH4 would cost me about $1350-1400. The advantages of the GH3/GM1 are that I still am able to have two cameras (one that works very well with the small primes I have), and it is obviously cheaper. The advantages of the GH4 (that I would use), are the higher burst rate, higher resolution EVF, focus peaking, and higher ISO limits in silent mode. I'd be interested to hear some other people's thoughts on this, they're very much appreciated.