I also own a tuned/slightly modified Challenger RT with a 5.7 Hemi pushing a little over 400 at the crank, I can attest that the butt meter between that one and my 2021 Denali are not as close as I would have thought. Apples and oranges I know... And again, can only really compare to the 5.3 in my old 2002 Tahoe, but based on my experience with that 15 yr old 5.3 Vortec, I really did not even want nor consider a real need for the 6.2 in the Yukon as I always thought that Tahoe had sufficient git up in city driving. Was driving both it and my Challenger interchangeably for some time and the butt meter felt much closer. Figured the 6.2 would be overkill but eventually fell in love with the perks/looks of the Denali and went with it, so glad that I did. Haven't driven a new 2021 with the 5.3 but in my opinion I bet there will be some folks complaining of it feeling underpowered since the 6.2 seems just about adequate for the size/weight of this new refresh. Maybe its a programming/transmission thing... I don't know. Test drove a 2020 Expedition with the 3.5 ecoboost before purchasing the Yukon and it felt a bit quicker than my 6.2.... and just think you get that in a 50k base model. Of course it's all anecdotal and we may end up being the minority once more folks get these in their driveways. But I can assure you all that Mike31 is not bs'ing or on a placebo high when he mentions some sluggishness with this new platform. I'm not drag racing this land yacht so at the end of the day it's not a huge deal, as long as the 6.2 does its job when I begin towing. Also not dogging the new 2021 platform nor do I regret my decision, it's the best full size suv out there right now imo... but it is an honest observation from someone who isn't just some paid car reviewer but someone who spent their hard earned money on this suv.