I don't think it's impossible for most guys to achieve a frame like Henry had in MOS. You eat a lot, you lift a lot, you sleep a lot. It's just that 90% of us don't have the luxury to have a world-class trainer looking out for us every step of the way.

Regular guys who get a Henry-Cavillesque body doing regular jobs require CRAZY amounts of commitment and self-discipline.
It's not an extreme like getting down to a clinically anorexic BMI or going up to a world-class bodybuilder level, similar to what Christian Bale put himself through for The Machinist and then Batman Begins in such a short time (although BB was not bodybuilder level, but it certainly was
huge compared to what he was less than a year before!). Most people probably would not have achieved that without some major health issues.
Henry's MOS body was a very good level, but not an extreme. I think a good number of guys would be capable of achieving that, given the luxuries he had.
Although if you're looking at
exact matching of measurements, then yeah, that has to do with how you're built.