7 Win Shares in a season is considered very good -- borderline all-star. Only one guy has ever achieved 25.0 or more WS in a season -- Kareem (Wilt had one rounded up from like 24.96). So, let's see who has done the best over the years at achieving various WS levels (I will list top 5 and ties for most seasons at that level).
7 WS, Most seasons: Kareem, Duncan, Karl, Stockton, tie between Barkley, KG, Moses, Reggie and Dirk
10 WS, most seasons -- Kareem, Karl, Wilt, Stockton, Duncan, Dirk
13WS, most seasons - Wilt, Karl, Jordan, Kareem, LeBron
16 WS, most seasons - Wilt, Jordan, Kareem, Oscar, LeBron, David
19 WS, most seasons -- Wilt, Michael, Kareem, Mikan, LeBron
22 WS, most seasons -- Kareem (2), Wilt (2), Mikan 1
25 WS, most seasons -- Kareem (1)
Kareem with Milwaukee in 1971-72 went 34-16-4 and shot 57%/ Kareem played over 44 mpg
Wilt with San Francisco in 1963-64 went 37-22-5 and shot 52%. Wilt played over 46 mpg.