Originally posted by LensBeginner ...it's phrased a bit like: "this exceptional SONY camera is wonderful... only the CHEATING big huge nasty Pentax which has a much, much bigger sensor, is just a tiny whiff better..."
Call me overly sensitive, but I almost never like the phrasing sites like DxO and DPReview choose when they just can't avoid praising Pentax...
it looks like they haven't actually tested the camera, so that rating is fwiw... but the sensor data is out there for comparison purposes, bill claff has posted it, i think that he can also get his data from raw photos that people send him??
the 645z should be "just a tiny whiff better"
because, among other things, it's dr vs. iso numbers are actually worse than the a7rii numbers at certain points in the scale... and the d810 is right behind 'em both... canon 5dsr is the real loser.
it's hard to tell in this graph because the green colors are the same, but the 645z curve is smooth and fairly straight, while the a7rii "curve" is showing the dual-gain technology(aptina?), giving it some jagged jumps on the scale.
you can mess around with the graph yourself:
Photographic Dynamic Range versus ISO Setting
yes the 645z has cleaner iso over the competition, but wrt the a7rii, some of those gains come because of downrezzing... here is the dpr scene comparison at iso12800, NOT fully downrezzed.
this shouldn't come as a surprise to anyone, in fact i've been predicting it for months on this forum, it's been obvious that sony is technologically far ahead of all of the dslr/ovf camera companies... they should be, they've been throwing money at r&d like drunken sailors home on shore leave
none of that is to say that the a7rii is the perfect ff camera; for example, some people have complained that it's not what they expected for astrophotography, to the extent that at least one a7rii owner bought a canon 6d for his night work... yes, it's bsi technology, but maybe it's fully wrung out because of the aptina technology? or perhaps the 42mp compromise because of video considerations was a factor.