Want to Buy WTB: Mamiya 7 80mm f/4

I'm considering switching to the 80mm for my Mamiya 7 as a single lens for a while. I currently have and use the 65mm which I am happy with, but there are times I'd like something just slightly narrower (which the 80mm seems to suit). I would consider trading my 65mm for an 80mm, but I would like to shoot them side by side before I decide which to let go of.

If you are willing to let me "rent" it from you before deciding to purchase that would also be awesome.