Does Sailfish OS support eSIM? as I understanf the difference between Xperia 10 V XQ-DC54 vs. XQ-DC72 is that former is single SIM + storage while latter one is dual SIM or single SIM+Storage but both of them supports eSIMs (under Android).
In the release notes there are lots of restrictions - including Camera(!?) but you said it works fine…
According to Sony manual:
XQ-DC54: nanoSim + micro sd + eSim
XQ-DC72: nanoSim + (micro sd or nanoSim)
back then there was an issue related to Xperia camera quality under SFOS vs. Android and the conclusion was something like that - if I recall right - there were/are some device specific certificates installed on the devices that enables/disables certain Camera features/qualities and they can somehow preserved during flashing SFOS and results in better image/video quality.
Is it still an issue and what to do if yes?
Can anyone share link to a webshop in EU that actually sell this Xperia 10 V (black) and delivers to Hungary?
I’ve failed miserably to find any but Rakuten in France but I was not able to change delivery adress to Hungary… 
Currently there’s one for sale on hardverapro.hu priced 95000 Ft, 1.5 years warranty.
That was a mistake. Fixed.
No, it does not. On the xq-cc54 and xq-dc54 phones, there is one SIM available, the physical SIM.
I ordered on from Jolla Devices Shop and got it with Sailfish OS (beta) preinstalled.
I can recommend this trusted shop I got my XPARIA XA2 from it years back and use it as a daily driver, still…