Mark Robins says that he has noticed the mentality of his side change in recent weeks as the Sky Blues extended their unbeaten run with a 4-0 win at the Ricoh Arena.
City's biggest win so far this season sees them climb up to sixth in SkyBet League Two, part thanks to a hat-trick by top-scorer Marc McNulty - City's second hat-trick hero of the season.
"I think everybody enjoyed that today," said Robins.
"It was a good professional performance.
"We were clinical in front of goal - even if it did take us a while to get going. All over the pitch we were good.
"Grimsby have had a big change around. They have tried to add pace to the side. Gary McSheffrey came in and, I would imagine, he would have been desperate to score against us today.
"They only threatened us one but that is me nitpicking. We were able to clear that chance and keep them a bay all game.
"The finish was magnificent from us. The set-pieces were good, and we haven't been good enough at that this season.
"Then to top it off: McNulty's strike for the fourth was fantastic. It was a brilliant strike.
Goals did not come fast for McNulty at first, but Robins was always adamant that the striker would come good. Today's hat-trick took the 25-year-old into the twenties for the season.
"I need to be careful because people will start to think I know what I am talking about," he said with a laugh.
"The most pleasing goal for me was the second. Clarke-Harris did all the work and then gave it to him on a plate. That put the game to bed."
He added: "I am really pleased for the players today. There has been a shift in mentality and you can see that. The belief is there. We have a tough game coming up on Friday so we will not get carried away, but we will enjoy this tonight.
"The suporters have enjoyed that and they have got right behind us today. We want to keep this going."