I'm essentially copying and pasting something I wrote a while ago, but Korver's season is extraordinary. Consider:
(1) Korver is currently on pace to break the all-time NBA single-season record for TS% - and the current top 15 there is populated almost completely by centers who did nothing but dunk (Chandler, Gilmore, Chamberlain, Dawkins etc.).
http://www.basketball-reference.com/leaders/ts_pct_season.html(If you don't feel like clicking, Tyson Chandler is currently #1 at 0.708, and Korver is currently at 0.736. He's not just challenging the record, he's threatening to obliterate it).
(2) He's also challenging for the all-time single-season 3PT% record, which he already holds:
http://www.basketball-reference.com/leaders/fg3_pct_season.html(He's at 0.528 and the record is 0.536)
But those numbers don't do his season justice. Every single other player who's shot similarly efficiently has been either a straight up dunker (a la Artis Gilmore), or a part-time, low-volume sharpshooter (a la Kerr or Legler).
As an example Korver's 3pt% this year is almost the best ever...and he's doing it at 3 times the shooting volume of his own prior record (5.7 attempts vs 2.1).
Indeed, no one else in the top 10 all-time got there by shooting more than 3.1 attempts per game. Most were shooting 1 or 2 threes per game in limited roles coming off the bench. (No one else in the top 10 was a starter except Schrempf, who shot <1 three per game and during the brief 94-96 period when the line was moved in).
Korver's doing it as a full-time player on one of the best teams in the league. He doesn't do a lot else, but compared to the rest of the guys on these lists he's Oscar Robertson.