Lemieux is so far ahead of Ovechkin it's really not fair to Ovechkin.
Hart finishes
Lemieux: 1, 1, 1, 2, 2, 2, 3, 4, 5,
Ovechkin: 1, 1, 1, 2, 2, 6, 6, 7, 10
Removing same finishes
Lemieux: 2, 3, 4, 5
Ovechkin: 6, 6, 7, 10
Adjusted points (even if I hate the HR formula)
Lemieux - 165
Lemieux - 156 (missed 12 games)
Lemieux - 141
Lemieux - 129 (missed 24 games)
Lemieux - 127
Ovechkin - 122
Ovechkin - 117
Lemieux - 116 (missed 18 games)
Ovechkin - 114
Lemieux - 110
Ovechkin - 107
Ovechkin - 104
Adjusted goals
Ovechkin - 72
Lemieux - 71 (missed 6 games)
Lemieux - 67 (missed 12 games)
Ovechkin - 62
Ovechkin - 60 (missed 1 game)
Lemieux - 59 (missed 5 games)
Ovechkin - 59 (missed 3 games)
Ovechkin - 58 (missed 4 games)
Ovechkin - 58 (missed 1 game)
Ovechkin - 57 (missed 3 games)
Lemieux - 56 (missed 24 games)
Ovechkin - 55 (missed 10 games)
Lemieux - 52 (missed 6 games)
Ovechkin - 52 (missed 1 game)
Ovechkin - 52 (missed 1 game)
Ovechkin - 50
They might be comparable in goal scoring peak (though Lemieux would have the top 4 in adjusted goals per game), but the total offensive production is not even close.
Lemieux has the five highest adjusted scoring seasons (and top six if you look at per game).
I think Lemieux is the most vulnerable of the Big Four, but he's so clearly a tier ahead of Ovechkin in all-time lists.