Interesting about reds, IDC produces drop dead perfect reds with wonderful tonality, to my eyes at least. Other RCs less so, in default mode anyway.
My use is landscape. I'd like a more refined shutter; a better, more user-friendly, less fragile, better placed cable release port; Live View; a full LCD histogram with channel selection, a RAW friendly histo display, and built-in UniWB option. Plus CZ wide primes, slow or fast, at least equivalent of the ZF/ZE ranges, but lighter like the CY range. We are never satisfied...