The 2001 has been panned pretty hard on this forum. I was looking at one, but took the advice of many here and went a different direction.
I've never worked with the Nady or the Superlux...but the Nady appears to be a Felio mic. Not sure what (if and) mods have been spec'ed by Nady to differentiate it from a bunch of others out there.
The 3035 has been reviewed quite a bit on this forum and many others. When it's good, it's very good. There are also some things that it just doesn't work well on.
I kinda doubt you'll find anyone that has all 4 of those mics that can do a "shootout". But you might want to do a search on the forum-I know some people have commented on the Nady-if memory serves me correctly, it's a LOT like the 2001.
I'd be interested to hear about the Superlux...it doesn't LOOK like most of the mass-produced mics being imported...but does it SOUND like them?