Without making any specific comments on Kane vs Datsyuk, here are a few stats from
@pnep that speak to Kane's ability to step up big playoff games:
Kane ranks 7th all-time in points per game in playoff elimination games (min 25 games) - behind only Gretzky, Lemieux, Perreault, Messier, Kurri and Richard. Making any type of reasonable adjustments for the leaguewide level of offense, he's probably behind only The Great One, Le Magnifique, and Rocket Richard.
Kane has the 3rd largest increase all-time in scoring in playoff elimination games (vs non elimination games) - min 25 games played, behind only Maurice Richard and Paul Holmgren. (Other players who look very good according to that metric include Kurri, Zetterberg, Lemieux, Messier, Hull, and Howe).
Kane had 49 points in playoff elimination games. For context, Mike Bossy has 52 (in five more games, in a much higher scoring era). Steve Yzerman has 53 (in 18 more games). Sidney Crosby has 50 (in 14 more games). Joe Sakic has 46 (in 11 more games). Doug Gilmour has 51 (in 12 more games). Kane's ability to score during big playoff games is matched by a very small number of players throughout NHL history.