I started on LUMIX and highly recommend. Their G stuff is like the Suzuki of the camera world. Super efficient, inexpensive, rarely fails and gets the job done. I had the GF1 with the pancake 20mm, it was truly a dream. They still do a similar form factor, I think the GX9. Not sure if they’ve done another since then.
I also had the GH3 for a while, great too, although the little power zoom 24-42 (I think) with that setup wasn’t as fast as the pancake.
Now I have a A7sii, it’s very dreamy and again just have a small Zeiss 35mm permanently attached. I’d love the 24-105 as a next lens but it’s super pricey.
The Sony I’m enjoying, battery life is a bit pedestrian and menus are kinda fiddly. I actually gas’d pretty badly over the new Z6 which was coming out at the time I was in the market, but ending up going with Sony at the last minute due to the overall bang for buck.
I had all sorts of tables going of feature comparison and pros and cons between models before buying, but now that it’s at my place and waiting in a bag for the next shoot you realise a camera today only really does 2 things - shoot photos, or shoot video. Some shoot video worse than others, but most take good photos. Lenses is where the money is. But all the features u think u need at the time, will print size be enough, is the crop factor this or that, etc etc, in the end it either shoots great photos, great video, or both.
Portability is probably a key factor for most, it is for me. Sometimes I just think I’d be happier with a G7Xmkii or iii. But I’m happy with the Sony. My phone does carry most of the weight these days but the mirrorless is there for when I need it.
I think camera companies try so hard to sell u on the specs, and many of them are great, but if you’re a hobbiest, most of it is pretty irrelevant. I have a friend who shoots on film in old reflex cameras and I swear his stuff is often more endearing than a lot of the sharp digital stuff.