Which fast prime lens is best for Olympus and Panasonic cameras?

tbh, go with the Panasonic Lumix G 25mm f/1.7 ASPH. for street work. The Olympus M.Zuiko Digital 45mm f/1.8 is too tight... i found it frustrating in tight crowds. Honestly, I was a bit disappointed with the 25mm's build quality cuz it feels kinda cheap, but it’s SO much more versatile for ur G9. For under $200, it’s basically the best value for low light. gl!

Totally agree! The Panasonic Lumix G 25mm f/1.7 ASPH. is solid, but in my experience the Sigma 30mm f/1.4 DC DN Contemporary for Micro Four Thirds is sharper and lowkey better for street work.

Yo! Just saw this thread and HAD to jump in because I've been literally OBSESSED with finding the perfect street lens for my G9 lately!! So, I know you were looking at the 25mm and 45mm, but iirc most street photographers find the 45mm way too tight... its like zoom-city lol. Honestly, you should seriously check out the Panasonic Lumix G 20mm f/1.7 II ASPH.. Its a pancake lens, so its super tiny and makes your setup way less scary to people on the street! Plus, the 40mm equivalent field of view is fantastic. If you want even CRAZIER low light, the Sigma 30mm f/1.4 DC DN Contemporary for Micro Four Thirds is basically a cheat code for your budget. Since its f/1.4, it lets in way more light than an f/1.7, which means your photos wont get all grainy at night. I'm still learning the technical specs, but the bokeh on that Sigma is just... chef's kiss!! TL;DR: Go with the Panasonic Lumix G 20mm f/1.7 II ASPH. for size/discretion, or the Sigma 30mm f/1.4 DC DN Contemporary for Micro Four Thirds for the absolute best sharpness and bokeh under $350. Are you planning on shooting mostly during the day or at night?? peace 👍

tbh if ur trying to stay under budget and want to learn the ropes, i'd look into manual focus primes. I know u were looking at the Panny 25mm, but the 7Artisans 25mm f/1.8 for Micro Four Thirds is a really fun, cheap way to get into low-light street photography. It's way under $100, which leaves u plenty of cash for other gear. The cool thing about these manual lenses is the DIY feel—u actually have to learn about depth of field and zone focusing. For street work, it's actually kinda faster once u get used to it cuz ur not waiting for the camera to hunt for focus in the dark. If u want something a bit faster for that low light, the TTArtisan 17mm f/1.4 ASPH for Micro Four Thirds is also a beast for the price. Both are super sharp in the center and give u that creamy bokeh without breaking the bank.

tbh, before you drop the cash, what kind of lighting and environment are we talking about? The G9 is a beast with its IBIS, but are you shooting in rain or just standard low-light city streets? Knowing if you need weather sealing (which neither the 25mm nor the 45mm have) is basically the first step for a reliable pro setup. From a market analysis perspective, cross-brand compatibility is generally fine in the M4/3 ecosystem, but you lose out on DFD (Depth From Defocus) optimization when you put Olympus glass on a Panasonic body. If you want the fastest AF tracking, stay native. Here are a couple of industry-standard alternatives that fit your street profile better: 1. Panasonic Leica DG Summilux 15mm f/1.7 ASPH. - This is the sweet spot for street. It gives you a 30mm equivalent field of view which is way more versatile than a 45mm. The build quality is far superior to the 25mm f/1.7, and you get an actual physical aperture ring.
2. Olympus M.Zuiko Digital ED 17mm f/1.8 - If you prefer a 35mm equivalent, this is a classic. It features a manual focus clutch which is standard for street photographers who like to zone focus. It's built like a tank and very reliable for long-term use.

ngl, I totally get the struggle of picking "the one"!!! I actually went a completely different route when I was starting out with my G9. Instead of dropping the full $350 on a brand new lens, I got really into the DIY side of things and started adapting vintage manual glass. I found that buying older lenses that need a tiny bit of TLC—like a quick cleaning of the mount or just some external dusting—is such a great way to save money for other gear. I picked up a Helios 44-2 58mm f/2 for basically nothing and honestly, the bokeh character is insane compared to modern clinical lenses. It’s kinda scary at first to trust yourself with "servicing" your own gear instead of sending it to a pro, but there are so many tutorials out there for basic maintenance. I basically learned how to do it myself because I couldn't afford professional service for every little thing. For street stuff, those manual rings feel so much more tactile than "fly-by-wire" autofocus. Plus, you can spend the rest of your budget on a really nice adapter! Has anyone else tried the "fixer-upper" route or am I just a glutton for punishment? lol.

Wait really?? Thats actually super helpful. I always thought it was the other way around.