I have experience w/both Leica M & Nikon RF VFs. IMHO, the Leicas are superior, but the Nikons are still perfectly useable. The S3 has fixed framelines that are reflected, not projected (like the SP or Leicas), so there's more flare from the eyepiece side, especially if you wear glasses, but I wear glasses & haven't had a problem.
Originally Posted by retina777
I am considering the purchase of a full size 35mm RF and am looking at a Nikon S3-2000 or a Leica M6. My concern is whether the older design viewfinder in the Nikon is significantly inferior to the Leica. I currently use a Retina III C and Mamiya 7 II and get on well with both. Does anyone have experience with the Nikon and Leica? Thank you.