Thanks guys. It still seems a bit undecided in a vacuum, so I will give more info in case anyone still wants to help, but I do feel a bit better about my shove the next day (even though I am still unsure).
I was only interested in playing for the win (or at least top 3), didn't care much about small cashing. >100 players had cashed already. I was on the bubble of the final table (10th). SB was loose with a similar stack size and had seen me make loose plays before. I had a much tighter table image earlier but the blinds and antes were going up quickly and forcing me into some plays (all mathematically correct though).
Anyway, SB ended up calling me with ATs, same suit, but his calling range had at least QJs in it based on earlier play. BB had about twice as many chips, had a tighter image than both of us, and folded as expected.
I know the mathematical books say Q8s is an easy shove with antes, and basically the only reason I questioned this was because the result didn't go my way. However, it still seemed like it could be a -EV shove to me in this sort of situation.
Maybe I am thinking about it incorrectly because I don't remember how many times this kind of shove has worked out, but honestly most MTTs I have won have been from waiting and picking up better hands in poorer spots (obviously you still need to get lucky either way and it is just a matter of picking whatever poison you prefer).
At the very least I think this thread will make me think twice about how tight the opponents in the blinds are in the future. I don't expect anyone to fold ATs to my shove, so I was going out of this one even if SB was a tighter player, but given his calling range was a lot wider than that, I think a fold could also be better here long term, even just in terms of going for the win and not caring about 9th.
Basically it just sucks to go out with Q8s wondering if it was the right play or not. However, I am probably being too results oriented and maybe I will see things differently again if I ever blind out in the future.