I really need to know which Sigma lens is actually the best for an X-T5 when shooting street at night because I am getting so many conflicting answers online and it is driving me crazy.

I've been looking at the Sigma 18-50mm f2.8 since everyone says it is the perfect small lens for the Fuji system and the size is great for being discreet but then I see people saying f2.8 just isnt enough when you are in dark back alleys or shooting under neon signs where the shadows are super deep. I am heading to Tokyo in about three weeks so I am on a tight timeline to get this sorted and I really want to capture that blade runner vibe without my ISO hitting 12800 and making everything look like mush.

Then I looked at the Sigma 30mm f1.4 which is way faster but then I read some forums saying the autofocus is kinda hunt-y on the X-T5 specifically or that it is not as sharp as the newer Fuji primes. But the Fuji primes are way out of my budget right now since I can only spend about 500 bucks max after buying the camera body itself. I also looked at the 16mm f1.4 but that seems way too wide for street stuff unless I want to be shoved in peoples faces which I really dont want to do.

I am just frustrated because I want that Sigma value but I cant tell if:

• The 18-50mm f2.8 is fast enough with the X-T5s IBIS
• The 30mm f1.4 is actually reliable for moving subjects at night
• There is some other Sigma option I am totally missing

I just want something that wont weigh me down while I am walking 20,000 steps a day but can actually handle the low light without looking terrible. Every review video I watch just shows beautiful sunny day shots which helps me exactly zero percent for what I actually need for this trip. The X-T5 is amazing but if I cant find a lens that works in the dark for under 500 dollars I am gonna be so annoyed...