Comparing Minolta to Leica is like comparing cameras to diamonds!
Leica is the TOP 35 mm camera, as far as I know, and dreadfully expensive. You might as well go for medium format if you want good quality.
I've done a lot of photography with Minolta (an X-700) since I was 16 years old, and recently somebody asked me whether the images were made with a medium format camera. I think it makes a big difference which lenses you use. The original Rokkor lenses (very heavy glass lenses) are quite good, but of course not comparable to Leica.
Since I have gone a step up to a medium format camera, I do see the difference in sharpness, but it is not really fair to compare a 35mm to a MF negative.