Which prime lens should I actually get for my a6400 because I am seriously about to throw this kit lens out the window. Every single shot I took last night in downtown Chicago came out grainy or just plain blurry and its honestly so frustrating when the gear fails. I need something fast and sharp for street stuff and I only have like $450 to spend before my sisters wedding next weekend so I'm in a huge rush.

• sigma 30mm maybe?
• or the sony 35mm?

I just want something that actually works in low light without hunting for focus for ten years straight...