Alright, theres some uninformed opinions on this thread.
Samp, I have owned both the SF and NL 10x32's and have extensive field experience with both.
As much as I wanted to love the SF's, I could not get over the blackout issue as well. Despite trying every possible option, it was always there.
I now have the NL's. They are significantly better in regard to the blackout/kidney bean issue. Also, with the FRP forehead rest, you can stay at a lower eyecup position for a truly immersive viewing experience and fine tune your eye position with the rest. Just because they have the same size exit pupil does NOT mean that they behave in the same manner.
I have not looked through the SFL's, but if you prefer Zeiss handling over Swaro and appreciate the fact that Zeiss deals with glare better, you might try the 10x40's. I personally preferred the handling of the SF's over the NL's.
In short, I could not live with the SF 10x32 but absolutely love the NL 10x32 for what it is.