Upgrading 50mm Sony E mount lens

Hi, all, I'm using the Sony FE 50mm f/1.8 lens on my Sony a7R III for low-light, hand-held street photography. I love its size and weight (tiny) and its image quality (very good) but the slow, uncertain autofocus is causing me to miss shots and is driving me crazy. I'm thinking of replacing it with the Sony Sonnar T* FE 55mm f/1.8 ZA Lens. Pretty expensive but maybe worth it for fast, low-light focusing? I'd actually rather go a little wider than 55mm, but the fast, high-quality 35mm lenses seem to be much heavier. Advice? Thoughts?

Only the expensive G and GMaster lenses seem to have quick auto focus on the Sony. The A7Riii has better AF than the M2 version, but it's no great shakes compared to the A9 and perhaps the A7iii. That said, you might find a manual lens used with zone-focusing in the classic "street" style of HCB would suit you. The Loxia 50/2 would be worth consideration. The Sony 55/1.8 is one of the sharpest Sony lenses.

Thanks, Ed. I did buy the 55mm Sony/Zeiss lens and it is WAY better at autofocus, as expected. It's 5x more expensive but worth it to me for the kind of stuff I do.