Impressed
Have now just spent two weeks with my new (to me) 2020 GLC 63 and am really impressed. Of course sounds truly awesome, but also has a very nice combination of handling, speed, braking and comfort. Not perfect - but well done. Really does feel like a taller sports sedan than an SUV. Compact outside but a lot of space inside. It is remarkably fun and easy to drive.
I have now had the privilege of owning the last three AMG V8 engines. While all excellent engines, I think I would put the 4.0TT on par with the 6.2 N/A and both slightly above the 5.5TT in terms of overall feel. I might still have the softest spot for that 6.2 N/A if pressed.