#3. "Compressibility could be a big variable..." In response to In response to 2
I assume that IR uses a standard test scene. As to which modes people use, I only know that wildlife shooters using the d300/s tend to use 12 bit lossless, while those using the D800 tend to shoot 14 bit lossless. But it does raise an interesting question when dealing with the D7100's restrictive buffer - whether 14 bit lossy or 12 bit lossless would make for better pictures?