domestics: I think GM is the style leader and it's showing in their market share. They've brought Cadillac back to the top by sticking with the V performance versions as the 'aspirational' models. More importantly, they are the best positioned in the Far East with their entrenched Buick brand following.
Japanese: I think Lexus has gone off the overly-bejeweled cliff (while Toyota continues to follow
Hyundai), Acura is once again trying to figure themselves out on Honda money (and will no doubt fail once again) and Infiniti seems to continue their quiet, subtle path of making interesting cars and questionable SUVs (maybe Nissan didn't inform Renault that they also own Infiniti?).
Hyundai: simply kicking a*s on the Japanese right now, they are slowly burying Toyota, have usurped Nissan and are seriously challenging Honda's reputation for quality...meanwhile they've positioned Kia to wipe up on the low end. South Korea's extensive STEM educational programs are creating fast-paths to success for Hyundai, Samsung, LG, etc. We are in trouble.
Euro brands: I think Audi leads the pack but I still like my BMWs