Re: Japanese-language only bodies
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Quite well, actually. Both my E-M1 II's were bought here in Japan, used. The first was pretty worn, but I knew that from the photos the seller provided on Amazon. (My understanding is that most big used camera sellers on Amazon Japan are local physical retail shops that are reusing photos and descriptions from listings on their own site. I avoid very new sellers or those that have completed fewer than say 100 transactions.) Sellers generally don't include shutter counts in their listings, so that's always a gamble. This one came to me with 30,000 shutter actuations, which I thought was fair for US$500. It's been trouble-free except for the well-known issue of the front grip coming off. I replaced it with a 3D-printed plastic insert from a fellow poster here – I think he is based in Australia. I should mention that this one came with its original box.
My second body was in like-new condition and cost me US$511. That one had only 4,679 shutter pulls! No box, though.
In general I think Japanese camera owners tend to be a bit more careful with their gear, perhaps a cultural thing. The two other cameras I purchased within the past couple of years (a GM5 and a Stylus 1) were on eBay and came from the US. I feel I got prices that were within my general budget-minded preferences – same as for the E-M1 II's purchased here in Japan. But, in the case of the GM5, it came with a moderate dent in the top plate that the seller did not disclose, and that the listing photos did not reveal. The Stylus 1 came with substantial grease or other gunk in the EVF optics that required partial disassembly to clean; in that case the seller was very apologetic and even offered to exchange for a different Stylus 1 at no charge. In both cases it wasn't worth doing the return thing, so I just did my best and enjoyed the cameras anyway. I won't be buying any more camera bodies on eBay from US sellers, though.
Ah, come to think of it, I did purchase a Canon M5 when I first began my mirrorless camera journey. That was also here in Japan. Came in a box, looked like new, great price. That was the experience that really opened my eyes to how "Good" listings in Japan are often closer to "Very Good" and sometimes "Like New". The thing I should have mentioned before is that here in Japan (land of no product returns), Amazon Japan is the one place where returns are generally accepted without question.
Oh, and related to your firmware comment – yes, some brands will not offer the English language for copies made for Japan. Sony is one of them, which is kind of a big disappointment, since I was thinking I should buy a Sony camera before I leave here. The funny thing is that last month I saw a GM5 on Amazon Japan that was being sold for less because it was a US model and didn't have the Japanese language menus! (Never had a problem with Olympus cameras, which always have the English option, and many other languages besides.)