Stupid call or right played ?

[Tropex]

I recently made a post about playing conservatively early rounds and maybe folding some hands like AA in case there's a decent chance in falling off if something went wrong. Now well I qualified for PS 900 FPP Qualifier through a 90 FPP satellite (to WCOOP Event #1) and this hand came:

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) pokerhand.org hand converter

BB (t1865)
UTG (t1230)
UTG+1 (t2820)
MP1 (t2970)
MP2 (t1200)
MP3 (t1505)
CO (t2690)
Hero (t2200)
SB (t1180)

Preflop: Hero is Button with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">MP1 raises to t100</font>, <font color="#666666">1 fold</font>, MP3 calls t100, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t500</font>, <font color="#666666">2 folds</font>, MP1 folds, MP3 calls t400.

Flop: (t1175) 3[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP3 bets t1005 (All-In)</font>, Hero calls t1005.

Turn: (t3185) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

River: (t3185) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: t3185

Was the call on flop correct ? I figured the worst there could be was ace for gutshot and maybe a pair. I won't post the result here yet though.