Second hand-old version:
1st version (including DR): $4000 to $5000 (not easy to find good one, the design is easy subject to flare but is the sharpest Summicron--in 12mm of center area)
2nd version: $4000 to $5000 (at $5500 almost mint) (easy to find good looking lens....with hood and caps)
3rd version (it was a current version without build in hood) : $4000 to $5000 (at $5500 almost mint) (very easy to find good looking lens with hood and caps)
Current version:-
4th version (current version with build in hood: $9500 (1000 pieces limited edition of 50 years version still available (hong goods) in Tin Cheung), $7300 (new water goods), $5500 to $6000 (as new - 2nd hand goods), $5000 ( mint to mint+), always available in ebay, internet 2nd hand offer and 2nd hand shop or by consignment in Central at Everbest.)
If the prices of Planner and Summicron are so near.....it is difficult to decide....
A Biogan fan......