Okay so the original poster kinda rigged teh question a bit with the now part as both guys have only played in 5 NHL seasons.
But lets look at what they did in those 5 seasons (and especially with Sid being 2 years younger) and try to find more than a handful of guys who ah better 1st 5 seasons in the history of the NHL.
Crosby
05-06: 81 GP, 39 G, 63 A, 102 P (Sixth overall in scoring)
06-07: 79 GP, 36 G, 84 A, 120 P (First overall in scoring)
07-08: 53 GP, 24 G, 48 A, 72 P (Second overall in PPG)
08-09: 77 GP, 33 G, 70 A, 103 P (Third overall in scoring)
09-10: 81 GP, 51 G, 58 A, 109 P (Second overall in scoring)
Ovechkin
05-06: 81 GP, 52 G, 54 A, 106 P (Third overall in scoring)
06-07: 82 GP, 46 G, 46 A, 92 P (Thirteenth overall in scoring)
07-08: 82 GP, 65 G, 47 A, 112 P (First overall in scoring)
08-09: 79 GP, 56 G, 54 A, 110 P (Second overall in scoring)
09-10: 72 GP, 50 G, 59 A, 109 P (Second overall in scoring)
If you can you more than the digits on your hands it would be very surprising. I can think of 4 who are in the same ball park as these 2 guys, to me that makes them generational players.