The Tremec makes a small pop too on upshifts but not every time. Dependent on the mode, traction and other variables. Overall it's very smooth.I thought he made a good point about the transmission. I can hear the difference between the TREMEC and the ZF ones used in the AMGs. I was watching a video and I believe the commentators said something similar. The AMGs make a distinct sound when it upshifts its like a weird farting sound, it sounds abrupt so I can see why they say it hard shifts. I believe thats because its the ZF? But a friend of mine has a GT500 and when I heard him drive it the shifting was really smooth and didn't make that distinct sound.
It could be a DCT vs Torque converter thing but I don't really know.