Pep Guardiola's side, having been level on points with Man United since week one, now have a two point lead over United at the top of the table following their demolition of Stoke City over the weekend.
De Bruyne also created Gabriel Jesus's victor on Tuesday night in the 2-1 win over Serie A leaders Napoli that maintained City's ideal start in the Champions League with three wins out of three.
City and United have shown dominant all-round performances to establish themselves at the top but De Bruyne, who has provided five assists and scored once for City in the league so far, would take nothing for granted.
"I think previous year we played good football but especially in the big games we didn't win them", De Bruyne added.
"For the moment I think so, but everybody's still there", the Belgium worldwide told ESPN FC. It's hard to say.
Asked what the differences are to last season, De Bruyne said: "Just that we are winning".More news: Electric Volkswagen to take on Pikes Peak
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He was injured for that penalty shoot-out triumph against Liverpool at Wembley and being viewed as a front-runner for England's top individual awards this season is not causing De Bruyne to lose sight of the bigger picture. "I was playing constantly at a good level but I think the team is now playing at a very high level".
The Brazilian has started the campaign in good form but Schmeichel insists that David de Gea and Thibaut Courtois give City's rivals "an edge" with Ederson still unproven. "It's not for me to do that discussion".
"Maybe somewhere later down the road I will go back in some capacity and I'd absolutely love to". "The way it looks at the moment is very positive".
"At the moment, we're playing maybe a little bit better, but we're just building on what we did past year and for the moment everything is going well".
He continued: 'I think we're pretty much what he wants.