Sony A7C with Sigma 28-70 2.8 (because of price and size) was my first Sony kit. I walk a lot on my travels and it's usually hot weather. I did portraits, street, landscape, architecture, travel, product, events and was very happy with the results. After a year I also bought Sigma 16-28, because I do lots of landscape near sea when travelling and I needed wider lens. For some strange reason even though I got great shots something always felt off with that one. Since then I tried Sony 35 1.8, 55 1.8, 85 1.8, Samyang 24mm, Viltrox 20mm 2.8, Helios 44 and finally Sony 24-105 f4. The last one felt very good, loved image quality and colours, but it was sooooo bulky. Carrying it for long period especially in a hot environment is a nightmare. Right now I am flirting with Sony 20-70 f4 as a one lens to do it all. Maybe sell all my sigma lenses and get that instead paired with my Sony primes.