It was
Whedon's decision to shoot digitally and in the 1.85:1 ratio, not McGarvey's. Whedon pretty much abandoned film when he did
Dollhouse S2 and
Dr. Horrible, and McGarvey was film-only up until
The Avengers. I do question them using the 1.85:1 frame since Whedon used the 2.40:1 for
Serenity to great effect.
McGarvey's been doing cinematography as long as Pfister has, so don't diss his work as amateurish. TA may not have the kind of polish and veneer Nolan's Batman trilogy had with the 35mm and IMAX footage, but there are some gorgeous shots there. There's even a few that are Nolan-esque in terms of composition and lighting.
There's a difference between airing your opinions and then being tactless. Pfister's comments come off as petty jealousy (aren't all cinematographers supposed to show off the sets as well?), and he should know better than to just shoot his mouth off like that.
Especially since he is guilty of doing similar rule-breakers -- like the TDK car chase which breaks a lot of editorial and cinematography rules. So look who's calling the kettle black, Wally.