It's been over 20 years since I shot with my Bronica EC-TL outfit and lenses. I had an assortment of lenses -- some Nikkors and some Zenzas. Looking back at the slides and negatives I shot, all I can say is that all the lenses I had for that old EC-TL did an excellent job. No vignetting, great corner-to-corner sharpness. I don't have any specific recollections regarding the wide angle I had. I don't even recall if it was a Nikkor, but it did a good job. Here's a shot taken with my 75mm f/2.8 Nikkor.
A section of the Painted Desert in northern Arizona. Bronica EC-TL, Nikkor 75mm f/2.8, Fujichrome 100. Scanned at 2400ppi with an Epson 4990.
Oh, and I recommend that you go for the S2 over the S. The S2 is much more reliable. The EC and EC-TL are also great choices. They're battery dependent, but well made, and they take the same lenses as the S and S2. I like the EC-TL because it has a built-in TTL meter, which I found to be quite accurate.