Ryan Lowe's 78th-minute winner gave the hosts a hard-fought victory over their bitter rivals, who are still seven points clear at the top of the division.
"I've said to the players that in my two years here that's probably as good as it's been from my team," admitted Knill. "Everything we asked of them and everything we worked on, they did it.
"And it feels sweeter to me not because they're our local rivals but because they're top of the league. We probably weren't coming into the game as favourites but I think we've shown that if we play to our full capability, we're a match for anybody in this league."