Alternative in what sense? I think most, if not all, modern Xperias have both headphone jacks and microSD slots. I'm not sure how they are when it comes to android updates though.
The 1 VI yes, but there's also a cheaper 10 VI. Seems like it is supposed to get 4 years of security updates [1] too, but I suppose only time will tell how that actually plays out.
Huh, the reviews I read seemed to say that the camera was a huge step up. (But maybe they were mostly comparing to the A53, which seemed uniformly to be regarded as a regression.) If not, then I feel quite stupid for paying the extra to "upgrade" to an A54, instead of an A52, from my A50.
(Also, though it's easy for me to believe this random search result is dodgy, and with the understanding that benchmarks don't mean much, Googling around for a chip comparison turned up https://gadgetversus.com/processor/qualcomm-sm7125-snapdrago... , which seems to suggest that the Exynos 1380 in the A54 wins over the Snapdragon 720G in the A52 in many benchmarks.)
There is no alternative below 1000 EUR.