Is this overplaying AK?

[QuietEarner]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.15/$0.30 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $27.85
Hero (BB): $60.00
UTG: $31.15
MP: $55.65
CO: $12.75
BTN: $12.00

Preflop: Hero is dealt K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, CO calls $0.30, BTN folds, SB calls $0.15, <font color="red">Hero raises to $1.20</font>, CO folds, <font color="red">SB raises to $3.90</font>, Hero calls $2.70
Uncalled bet of $0.00 returned to Hero

Flop: ($8.10) K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">SB bets $6.00</font>, <font color="red">Hero raises all-in to $56.10</font>, SB calls all-in for $17.95
Uncalled bet of $32.15 returned to Hero

Pot Size: $56.00