Hand Reading Exercise and a Shocking Laydown

[Jeffage]

Playing in the same good 5 game at the Taj. Here is the hand. What do me and my main opponent have? I open raise 2nd UTG. 4 people coldcall (I told you this was a good game). A friend of mine, a tight but very solid player in my opinion calls 8 more out of his SB (already somewhat of a warning bell). BB calls. Big pot. Flop comes K-9-3 with two spades (I have no spades). Check to me and I bet it, like 4 callers including my buddy in the SB (danger will Robinson). Turn is an offsuit Queen. Board K-9-3-Q. Check to me, I bet, two callers, and now SB checkraises me. I call. Others fold. The river is an ace for a final board of K-9-3-Q-A. SB checks (!), I bet, he thinks briefly and folds. What did we both have, and was it well played? Full details to come.

Jeff