I am considering one of these lenses (the former used and much cheaper). What are the differences as the Hasselblad site PDF's don't download correctly on my computer.
The IF version has better resolving power.
The non-IF is near perfect in the image center, but performance of the IF version drops much less going away from the center.
And the performance of the IF-version in the center itself is even a bit better as well.
But that comes at a price: distortion has more than doubled (max. 3.6% of image height), compared to the non-IF (max. 1.5%).
The IF was advertised as a "digital" lens. And yes: if you can clip away (like too small sensor do) the bits where distortion really is terrible (the edges and corners of the frame) and keep the near perfect center performance, it would be one of the very best lenses ever made.
For normal, "full frame" film photography, i think the non-IF version is preferable.