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Simply called SMI. A7R result of 78/75 is a "meh". D800E has 77/74 (I guess these sensors are really very similar). And for example 1D-X has 73/74, which is a bit.. tragic. Especially compared to 1D/s MK3 .
Bottom is currently 6D with 69/70. Thats somewhere around "tragicomedy" level. Quite visible in all pics taken with it.
Obviously people dont have same vision of colors and some are more or less colorblind. Since most photographers are still men, which are even more colorblind, it doesnt matter that much as it could.
That said, SMI is directly tied to CFA used. Better you get,...Show more →
So, if we take the RX1 (84/81) and RX1r (79/75) example I cited, your conclusion is that these two cameras are using a completely different CFA which is why they differ? I suspect there is more to it, perhaps including the AA filter as well as software tuning. Anyway, I bet the A7 with it's AA filter will likely have a better measurement. Incidentally, the Leica M 240 only scores 75/71 but I really don't hear folks talking about how bad Leica color is. I suspect the delta has to be pretty large to really matter. Per DxO:
"In practice, the SMI for DSLRs ranges between 75 and 85, and is not very discriminating." Given the somewhat arbitrary nature of these scores you mentioned (and theSuede previously also mentioned), I don't think these scores really mean that much in practice.