I feel a cbet is slightly superior to check...as played with sb calling also...its a fold. Save your chips because one of them has at least spades which drastically diminishes your hand equity and its a tourney.(more reason i like cbet/than check flop)

how big do u cbet?

I think you can get away with a relatively small bet in tournament play....maybe someone with more plo-ment exp. can comment here.... 875?

Flop equities
board: Qs5s9h
Hand Equity Wins Ties
JT,ss, KKss, Q9,99,55 37.26% 215,532 16,219
7c9cTs8h 25.47% 144,190 17,382
JT,ss, KKss, Q9,99,55 37.27% 215,643 16,166

Given you checked i would have folded on the flop. With the ranges i put into pro poker tools it gives you 25%. Without spades in your hands then i would preserve your chips once checked. Betting the Flop: on this board it seems like you would need to bet 70%+ of the pot to get a decent amount of folds. The calling positions were MP3 and SB which would make their ranges a little stronger (without specific reads) so could have you in draw domination situation on the flop a little too often to continue