Really excited to see how this turns out. I like the 4k internal recording of the GH4, and generally like the looks of it for video better than the A7S, buuuut, I also need excellent stills capabilities. A combo of the A7S and A7R could replace my current D800/XF300 setup without sacrificing anything on the stills side. I'd been considering selling the XF300 to pick up a GH4, but that'd mean some lens replication between different mounts. Switching everything out to Sony would be very convenient. And, as someone who shoots a ton of run and gun in terrible light, the high ISO quality is very appealing.