Hi John,
This sounds like a really nice idea!
I do have a SDR-Kits VNA 3SE, but I won't offer to lend it to you since I am in Sweden.
However, I am interested in following the procedures and results in your shootout,
since I was planning to do something similar myself.
I have access to several of the HPs (8752A 8753D and other) at my work at KTH University.
These are donations and have seen much use, so a I am unsure of how well they work now.
They are not easy to use for students either. This is where a nanoVNA or VNA 3SE would come in handy.
I have also recently ordered a nanoVNA V2 to test along with my nanoVNA H model.
If you can publish calibration and test procedures on your blogspot,
several of us can cooperate to replicate different measurements.
The SDR-kits has only one manufacturer, but I am aware of the "Clone Wars" of the nanoVNAs.
I am not counting on the nanoVNA V2 I ordered to manage 3 or 4.4 GHz until I see it,
and if we have a common test method we can perhaps easier identify bad manufacturers or models,
and compare relevant specs.
Sincerely,
Carl-Mikael
Not a Ham, just a a university professor
Carl-Mikael Zetterling