It’s more complicated than simply width. The sport seats in my son’s A4 aren’t any narrower than my Scion, but I have all I can do to get in and out of them because of (1) the side bolsters, and (2) the B-pillars. Oh, and (3) my back. My back is probably the real root of the problem.
Anyway, the comfort of seats is a highly personal thing, and the days of big plush seats is long gone, so the only way to tell is to sit.