A healthy Malkin is still the best player (or forward, if you want to make a case for Karlsson) in the world not named Crosby or McDavid.
That's the caveat. He's not healthy for a full season.
Jut for fun, I'll list both Malkin and Kane stats here for the past 5 seasons. After Malkin's marvelous Hart/Art campaign.
12-13:
Malkin: 31GP 9G 24A 33P 1.06PPG
Kane:
47GP 23G 32A 55P
1.17PPG
13-14:
Malkin: 60GP 23G 49A 72P
1.20PPG
Kane:
69GP 29G 40A 69P 1.00PPG
14-15:
Malkin:
69GP 28G 42A 70P 1.01PPG
Kane: 61GP 27G 37A 64P
1.05PPG
15-16:
Malkin: 57GP 27G 31A 58P 1.02PPG
Kane:
82GP 46G 60A 106P
1.29PPG
16-17:
Malkin: 62GP 33G 39A 72P
1.16PPG
Kane:
82GP 34G 55A 89P 1.09PPG
Overall for the past 5 seasons:
Malkin: 279GP 120G 185A 305P 1.09PPG
Kane:
341GP 159G 224A 383P
1.12PPG
Overall for the past 3 seasons:
Malkin: 188GP 88G 112A 200P 1.06PPG
Kane:
225GP 107G 152A 259P
1.15PPG
So, in the recent years Kane has been more healthy AND produced better on average. There's a very good argument to be made that over the past 3 season Kane has been both better and more healthy player than Malkin.