Carl Zeiss 50mm f/4 Distagon T* C
+2 in the comments!
Check out my other photo where I go on and on about how much I like using a Hasselblad :)
This lens pictured was actually sourced by Bellamy Hunt (he had it for a great price at his online shop) the fantastic guy behind Japan Camera Hunter who runs a blog I follow <religiously which he updates with fellow photographers' bag shots, places to shop for camera gear out east (he just finished his Hong Kong series) and of course, he's the guy you want to talk to if you want that camera of your dreams that you can't find locally or don't want to trust ebay. He's incredibly knowledgeable, and a joy to deal with. I'll be using his services more in the future for sure.
About the lens: As much as I love my 80mm f/2.8 for the system, I've always enjoyed a wider field of view for landscape and street shooting, and this 50mm fits the bill perfectly.
For starters, it's HEAVY I swear it weighs more than the camera itself. Other than that, it performs superbly for being manufactured in 1974. The ergonomics are great, it's as sharp as you'll ever want and that legendary T* coating and zeiss optics are everything you expect and appreciate from fine German engineering :)
Not too much else to add, if you're looking for a 32mm ish equivalent in medium format for a bargain, don't look any further.