What new lenses, apart from the new-ish PC models? What remains are new but the same 30+ year-old designs. The little 45/2.8 Ai-P I have was rolled out with the FM3A and was among the last "new" MF lenses. That was 2001.
That little 45 /2.8 lens might just be the same optical formula as the old 45 / 2.8 GN (guide number) lens. Both are Tessars. I have the GN lens, and it's pretty good.