Hi Nick,

I have shot Minoltas for my work for over 20 years now and have both of the lenses you are talking about, and in real world usuage, you will find virtually NO difference in the two lenses, I use my 1.4 only because I have it, the small amount of increase in f/stop has never once made a difference in what I can shoot or when, save the money and buy more film, the 50mm f/1.7 is probably one of the best values on the market now a days, high quality, great pictures and tack sharp, as far as being adequate, I am positive you will find far more than adequate, it is great performer.