From what I know, the Zeiss SFs (when announced) leapt over the equivalent ELs in terms of the handling balance, the wider FOV, the deliberate introduction of optical aspects that would minimize the rolling ball effect in an instrument with field flatteners etc. This was of course prior to the NL Pures being announced.
The NLs then leap-frogged over the SFs in many ways (including even wider FOV), and Swarovski then concurrently lowered the price of the ELs to significantly below that of the SFs. Handling wise, I felt the SFs were superior to the ELs and even the NLs.
I have an NL 12 on the way, as an aside, since I am fine with the trade-offs of the NL, vis-a-vis the SF, in addition to the fact that the NL is a 12.
The Zeiss SFLs (seemingly built in Japan, as opposed to the SFs that are German manufactured) have gathered high praise, and even though I have not tried them yet, certainly intrigues me. Relatively light, have 40mm objectives , and have sublime build quality......and going after the NL 32s, from what I heard.