I have a Zeiss 21mm f4.5 lens here for sale, in black finish. Included are the lens hood and the (fantastic) viewfinder, and boxes for all.
This lens has been professionally coded so your M8 and M9 will think it is a 21mm pre-ASPH lens.
Everything is in pristine condition, very near band-new looking.
I'd like to get $1200 plus shipping and PP for the kit, which I think is a very fair price for one in this condition with the coding.
I'm switching to a 24mm lens, as this is a bit too wide for my preferences as a 'go to' wide angle.
I'd consider swapping for an 18mm Zeiss as well.
I have extensive history with camera gear on Ebay (MJM6), but have been avoiding that site for the past few years because of the rampant fraud. PM or email me for more information.