I think I read somewhere Muledeer maybe, that you will get an extra five minutes dawn and dusk with an 8x42 over a 8x32. I've been hunting since 1965 and I don't recall ever taking a shot that early or late, maybe because I didn't have good low light binocs but I doubt it.
John
I tend to agree with JB on the extra 5 minutes, but can flatly say that I've take a good number of critters within those short windows.