[cjromero]

I tend to play Q high flushes safely on the turn as you did, mainly because I always seem to remember the few times I lost to a K or A high flush, and manage to forget the many more times I didn't extract full value.

If I capped the turn and UTG+1 led on the river again, I would be inclined to just call the river bet. A cap on the turn screams a made flush, which he obviously isn't afraid of. I seem to recall reading that this is the wisest play with a Q high flush. If you had the K or A, then it's a clear re-raise/cap situation.