Currently I own a Canon 80D + 24-70mm f2.8 + 70-200mm f2.8 IS and I do sports photography part time. However due to NS coming soon i'm planning to sell all my gear and get a Sony a7iii + Techart PRO LM-EA7 + Helios 44-2 58mm f2 for hobby. Is it worth it to upgrade just to get 1 vintage lens and...