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Hah I was about to post the same. On my 5d2, when I boost shadows in high iso situation, I want to throw up. First time I pushed shadows on nex-7 it was a revelation.
I almost always shoot at iso100 and iso 160 when on a tripod. I do lift shadows slightly, not a whole lot and try to expose a bit more to the right. That is ok since the highlights are handled nicely in the Canon. In the Nikon D800E they are a bit harsher. of course on the Nikon (and I assume the Sony also) one can underexpose 1 to 2 stops further and protect the highlights.
At high iso all bets are off, images are noisy regardless and yes, underexpose a bit when using high iso and lift shadows and it is nasty.
Yes, at 100% the Canon shadows look somewhat nasty at times but in print they don't really show much at all unless you print very large and do not lift them too high from to low. Most of my work ends up in Magazines (yes, I get paid for my photography) and by now I have a pretty good eye for what will really show and what won't.
For very large prints I use a PhaseOne IQ160 with Rodenstock HR lenses anyway, which of course wipes the floor silly with the Nikon D800E in large prints. Yes I tested it, it's not close, no matter what some reviews lead you to believe.
But back on topic, would be nice to have someone make some nice and precise Ef to Sony FE adapters that do not cause misalignment issues. I would pay good money for it.