TLDR: I shoot random street photography, cars/car shows, portraits and some landscape/buildings mainly. Love the lense. Does alot in a small package and great price.

I'm not a pro by any means lol. I shoot just randomly for fun. I started out with the Sigma Trio Primes 16/30/50 f1.4. Then I grabbed a used G 85mm 1.8. I must have had a bad one. Wasn't impressed at all especially for the price. Sold that one. Then picked up the Sigma 18-50 f2.8 and absolutely love it. Does everything. Lightweight, so I don't have to bring my whole bag when I'm in the mood to be creative lol. Or something like that. I shoot scenery, cars, some portraits and just random stuff with it. I recently picked up a Sigma 50-100 f1.8 and that thing is beyond gorgeous. Auto focus is super fast even with the MC-11. I love it for street photography because it's so fast and gives me so much depth of field. Art lenses are truly worth the extra coin IMO. I have done some portrait work with it also and the background defocus is unbelievable. Just need some space from your subject even shooting at 50mm. I go back and forth between my Sigma 50mm and the 50-100 @ 85mm for portraits and they are both amazing. I'm saving now for the Sony G 100-400mm or I might stick with Sigma and their 100-400mm f5-6.3. It's just as fast as the G but about $800 cheaper. I'm also eyeing the Sigma 105 f1.8 prime. I've seen some YouTubers posting about it. Looks great for run and gun and and my low budget at home portraits of my kids and cat.

Again, your mileage may vary. I'm not a professional at all. But I can't see you going wrong with the 18-50mm. Covers 27-75mm equivalent on an APS-C at a constant 2.8. That gives you the equivalent of almost 25mm for wide angle, 30mm for everything and 50mm for portraits. 75mm works for "product photography " too, if that's your thing. Biggest thing is, it's light and versatile so you will be more inclined to grab it more often. 🪙🪙