Lundqvist = Luongo. For a period of time in their careers, they're considered to be the best or among the best goaltenders in the world, but they're also Cupless and were ultimately outperformed by their counterparts in the playoffs.
And to address the other discussion comparing Lundqvist to Hasek, no, he's no Hasek. Hasek did more with less and was the best player in the league for a couple of years.
Lundqvist is certainly one of the top 3-5 goalies in the league though, and that group is usually in a rotation between himself, Quick, Price, Rinne and Rask. Same applies with any other position too, there's no constant as to who is the best as it rotates between Ovechkin, Crosby, Malkin and Stamkos or with Karlsson, Keith, Subban, Doughty and Weber for dmen. So long as they're consistently performing in that upper echelon, they're among the best.
From year to year you can make a case for who the best is in their respective positions, but can anyone definitively say there's been a single player who has been the clear cut best at his position year after year? Nope.