Monday's fixture saw former Swansea striker Danny Graham net for the Tigers to end a 30-game goal drought.
But his strike partner Sagbo also turned in a tireless display, and Bruce admitted he has been surprised at how well the Ivory Coast international has adapted since his move from Evian.
Bruce said: "He was terrific, he was top class. Strikers are always judged on goals and he has to put that in his locker, but his work-rate and his ability to hold the ball up is fantastic.
"He can only get better, it's difficult for any player to come in to play in the Premier League but he has done really well.
"You have to admit it's a gamble when you sign someone from France as you wonder can they adapt? Can they settle down? It's a different game.
"I was there last week and it's a very different game, but he is adapting."
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