I'd rather have cleaner pushed shadows at base ISO's, effectively improving DR over slightly less noise at ISO 12800. To me Canon sensor tech is still way behind Sony. I just love pushing shadows and pulling highlights.
Anyone using the old argument of learning the gear better, or bringing fill lights, that is such a joke. A real photog knows that they'll have to push and pull to get the image looking right.
I'm sorry, but I have yet to see one person prove the difference means anything in practice. I push/pull some of my Canon photos pretty hard, including crop sensor RAWs, without difficulty. Is there more noise then there would be on a Sony sensor while pixel peeping? Yes. Does it ruin the image when viewed normally? Can't even see it.
Sure you can underexpose a dark brick wall and shove the ACR slider to +5 and the Sony looks better. (And if you want to bias it, turn NR down or off completely.) Right up until it's compared to a properly exposed shot and you realize that A) you shouldn't rely on ACR to fix gross exposure errors, and B) if you need dramatic DR then you are best off blending exposures. Tonality is typically trashed in the dark brick wall samples people use to "prove" that Sony sensors have better DR.
Sony sensors have better DR, but not by enough to be worth the forum drama. Personally I would rather have the cleaner overall high ISO.
Oh yeah..."real photogs" do everything in their power to capture great light and/or shape their light, because light is everything.
If their choice is between pushing shadow detail that has no real tonality or pushing an image that was blended or shot with a graduated ND filter, they will choose the latter if at all possible.