Unfortunately older glass just wont resolve 40MP. My Fujifilm XF 18-55mm f2.8-4 R LM OIS was disappointing.

• Do you prefer primes? High pixel density requires updated glass like Fujifilm XF 18mm f1.4 R LM WR.

Unfortunately, my Fujifilm XF 16-80mm f4 R OIS WR failed me in Shinjuku with poor corner MTF data.

• 16-80mm: Optical diffraction.
• Fujifilm XF 23mm f1.4 R LM WR: Linear motor, superior resolution. Reliable sealing is vital.

Honestly, only the newest glass really holds up to that 40MP sensor. I had a miserable experience in Osaka last year where my favorite walkaround lens just couldnt resolve any detail, everything looked soft and muddy. It really ruined my shots.

• Are you looking for a versatile zoom for the city?
• Or do you want a fast prime specifically for those dark izakayas?

Building on the earlier suggestion, the Fujifilm XF 33mm f1.4 R LM WR is basically built for that high-density sensor. It uses a linear motor for near-instant focus and the optics are designed specifically to resolve 40MP files without diffraction issues. Its about 800 bucks so it fits the budget perfectly. Plus that f1.4 is a lifesaver for dim Tokyo restaurants and night street stuff. It handles the resolution well.

I have been very satisfied using the Fujifilm XF 16-55mm f2.8 R LM WR for high-resolution work. It is a professional-grade tool that handles the 40MP sensor with no complaints at all. Even though it is a slightly older design, Fuji officially lists it as capable of resolving the full detail of your X-T5 sensor. It works well for a trip to Tokyo because:

• The focal range covers tight food shots and wide street scenes effortlessly.
• Constant f2.8 aperture is reliable in lower light situations.
• It is fully weather-sealed, which is basically a safety requirement for travel. I have found that the IBIS in the X-T5 makes up for the lack of lens stabilization perfectly. It is a heavy lens, but it feels secure and balanced on that body. You can usually find a clean used copy or a sale price that lands right around your 900 dollar budget... honestly, it is the safest choice if you want one lens that does everything without compromising on image quality.

Seconded!

Did this last week, worked perfectly

I've been shooting with Fuji gear for over a decade now, and moving to the X-T5 definitely forced me to rethink my kit. I just found this thread and wanted to chime in because I had the same realization about my old glass looking a bit tired on the new sensor. For my last trip, I decided to try something a bit different and grabbed the Fujifilm XF 30mm f2.8 R LM WR Macro. I was honestly so happy with how it performed. It's one of the newer designs specifically built for that high-res sensor, and it really shows in the textures of the city. Street photography in Tokyo can be a bit claustrophobic, and this lens handled the tight spaces perfectly. Since it's a macro, the food shots were a breeze... I didnt have to worry about the minimum focus distance at all when shooting ramen or sushi. It's super light, very snappy, and costs around 600 bucks. It might not be as fast as the f1.4 glass, but for a one-and-done travel lens, I found it much more useful than I expected. No complaints at all after using it for two weeks straight.

Finally someone says it. Ive been thinking this for a while but wasnt sure.