Oh thanks to all! Huge collective reply (sorry!)
Eugene : The Tessar should be a nice bargain lens, if you manage to get the f/2.8 one
ZeissFan : The cleaning marks are almost invisible, there are some, but pretty light. The item looks much better than how the seller described it on ebay.
Mike : I'll be surely checking Rick's page
The light blue coating on the lens is lovely, exactly like on my 180/2.8 Olympia Sonnar (P6)
Taffer : the pain is far from being finished! I'm still waiting for the 85/2 J-9... and I missed an auction for a 35/2.8 CZJ Biometar (in Contax mount)
franceluxemburg : I'll write this in english though I think I could use french with you
I'm getting myself a J-3!!!