If you love wide angles, the 20mm is the best. My favorite for street photography. As I mentioned above all older cameras and equipment may need a CLA (clean, lube, adjust), often light seals need to be replaced and cameras work best once they’ve been gone over, so please budget for that. Some of this equipment is 50-60 years old. That said, I’ve never acquired gear that wasn’t working, though if a camera needs a battery not made anymore, like the mercury batteries that many used, I just used a separate meter or learned to guess exposure with the Sunny 16 rule. Photography is an amazing gift and I want you to be able to make great art for many years to come.