The vast majority put Howe above Lemieux, and McDavid, so far is projecting to finish above Howe.
After 8 years in the league, McDavid has won the Art Ross 5 times. He's been top 2 in scoring 7 years straight, while also being the top scoring Canadian player. After this season it's highly likely to be 6 Art Ross, and 8 straight years of being top 2 and the top Canadian. This, at minimum matches Howe's Peak, and it would be fair to say, surpasses his peak. Still a way to go to reach Howe's prime though, as that lasted 20 years. Taking into account that the NHL is a global league now, if McDavid can be a top 5 player for 15 years, he'll surpass Howe in both peak and Prime.