What is the best all-around prime lens for Lumix M43?

Basically, moving from a zoom to a prime means ur trading convenience for better low-light performance. It’s a big step because you’re stuck with one field of view, so choosing the right focal length is highkey the most important part.

In my experience, here is how they stack up:

The Panasonic Lumix G 20mm f/1.7 II ASPH is literally the smallest setup you can get. It's crazy sharp, but honestly, the autofocus is kinda slow and can hunt a bit in dim light. I've missed a few family shots because it didn't lock on fast enough...

The Panasonic Leica DG Summilux 15mm f/1.7 ASPH is what I usually recommend for a Panasonic Lumix DMC-GX85. It’s wider, which is a lifesaver for indoor shots where you can’t always back up. Plus, the AF is way faster and more reliable than the 20mm. It’s a bit more expensive, but it's a safer bet for a 'do-it-all' lens that won't let you down. gl!

tbh if ur on a GX85, you should *seriously* look at the Olympus M.Zuiko Digital 17mm f/1.8. Since the others were already mentioned, this bridges the gap perfectly. The 20mm is sharp but its AF motor is kinda slow for moving kids... the 17mm is way snappier and the 35mm equivalent is literally the gold standard for street. Honestly, it works well for everything and I'm super satisfied. gl!

> Which single lens provides the best balance of size, sharpness, and focal length for daily use?

tbh if ur on a budget, look at the Panasonic Lumix G 25mm f/1.7 ASPH..
- 25mm: Super cheap, fast AF, great low light.
- 15mm/20mm: wider but way more expensive than this one.
The 25mm is tighter, so you'll have to step back in small rooms, but for the money it's the safest "step up" from a kit lens. maybe check some sample photos first? gl

Honestly, I have to disagree with some of the advice here because focusing just on the focal length misses the bigger picture of system integration. If youre using a GX85, you really should consider the technical advantages of staying within the same brand ecosystem rather than mixing and matching. The way the AF algorithms communicate with the sensor is pretty specific to each manufacturer, and you might find third-party or cross-brand glass feels a bit sluggish in comparison, especially for moving subjects like family shots. Heres what I would look at instead of just picking a random focal length:

• Stick with any of the premium glass from the same manufacturer as your camera body
• Focus on the lines that mention specialized coatings for flare resistance
• Look into the lenses that are specifically optimized for the DFD contrast detection system Basically, any high-end glass from the same brand is gonna give you better color science and faster communication for those family shots. Its less about the specific millimeter and more about how the firmware handles the lens profile, right? You cant go wrong if you stay native.