Stephen, I've had both the Bessa R and the R3A; both now sold. When I had the R3A, I used it w/ a 40 (the Minolta Rokkor-M 40/2). I wear glasses, and the 40 framelines on the R3A are on the outer edges of the vf and were a little hard to see. The R2A, otoh, has the same vf magnification as the Bessa R, and the same framelines too. If you're interested in the 40 Nokton, you might consider getting an R2A instead and learning to frame w/ the 35 framelines. They're probably not too different, particularly at a distance. I think the big deal about the R3A is the 1:1 vf magnification, and the framelines for 50 and 75. But those considerations turned out to be not so important to me.
More generally, I thought the Bessa R was a delightful, simple camera. The shutter is a bit loud, but in every other respect I liked mine (but I sold it to fund the purchase of an M2). The vf was gloriously bright, I liked the framelines, and the fact that I could use a 28 w/out resort to an auxiliary finder.
As for the R3A, I bought it b/c of the 40 framelines, but those turned out to be not so hot to use in practice as I indicated above. The camera has a more solid feel to it than the Bessa R (and it is a little heavier), and the shutter is a little quieter. The AE on mine was excellent; I used it to shoot candids at a wedding, and the exposures were right on the mark. If you wanted an AE camera to use primarily w/ a 50 lens, the R3A would be a very good choice. However, I did have rf alignment issues (for some reason the R3* series has been prone to these), and it took a few trips to the repairman before they were finally corrected. In the end, I decided to go the SLR route for AE when I realized that a Minolta XD body was the same size as the R3A (the Minolta's shutter is much quieter, and the AE is as good or better). So, long story short, I sold the R3A. It's a nice camera, but I wouldn't buy another one for the 40 framelines; I'd get an R2A instead... or an M3. 🙂