Drake,
Just curious, what were your concerns with the 150LS 3.5? The 150 LS 2.8 at 7K, is not happening for me. Schneider/Phase One sadly has taken the newer lenses into the stratosphere for pricing, only still have a 1 year warranty (unless you happen to get a lens when you purchase a new back which is not an upgrade)
I don't need the F2.8 speed and the size/weight of the 150mm LS 3.5 seems to be a better carry lens in the field.
Thanks
Paul C