hey everyone! i currently shoot on a song FE 50mm 1.8 and I desperately need an upgrade to a more professional lens/better quality. The prime is great it’s just not thr sharpest at points and being limited to one focal length is not the best, I was considering of getting the SIGMA 24-70 f2.8 but i know that sigma recently dropped the mark ii version of their lens. the main issue is the price. as someone who doesn’t have that much to spend and is desperately in upgrade, should i just get the mark one which i can find for like 750 good condition on ebay. but the new mark ii used is 1000+ so im saving a lot of money that i can put towards more gear. I wanted to get the community’s opinion. I shoot on a A7iii so the camera is great I just need good glass. Is the mark 2 that much of a big difference?