> torn between the Sigma 35mm f2 and the Panny 35mm f1.8 for my S5ii. Honestly, for the S5ii specifically, the Panasonic Lumix S 35mm f1.8 is probably the more practical choice for street work. Native glass usually communicates a bit better with the phase hybrid AF when subjects are moving around. The Sigma 35mm f2 DG DN Contemporary feels amazing and is built like a tank, but that extra weight starts to feel heavy after a few hours of walking. Since you mentioned the London rain, that weather sealing on the Panny is definitely worth having. You can often find it for well under $500 if you shop around used on sites like MPB, which keeps you well under your budget. Its a solid lens that just works and balances perfectly on the S5ii body. If you have more questions about the l-mount ecosystem or other budget primes let me know.