[dibsy]

The all-in UTG is complicating things here: (a) because a raise does not have the same probability-adjusted equity (i.e. if SB folds to raise, you only win 3K for sure and 12K with some %), and (b) the fact that you (they) will see their (your) cards no matter what makes people do funny things

In this instance, I call and fold to any pushes by Button. Must have plan for what to do on turn if you make your straight, or if a spade, T, 9, A, or if board pairs (other than K).

If no all-in UTG, I might min raise or push some percentage of the time and call some other (bigger) percentage (depending on my image and read on SB/Button).

[edited: "any pushes by BB" to "any pushes by Button" in 2nd paragraph]