Thanks for answers. After some additional research I have decided to go with Swisswax Leather Kit. I have still Gyeon products, however i will not use it on M5 Leather. This is the effect of using this product for one year in M4 leather:
https://photos.app.goo.gl/wMiye2PdpbDJq6EG9
The M4 leather got to shiny for me, and I was using both - cleaner and leather coat.
To compare - I want to keep the mat appearance of my steering wheel and seats that you can see below for as long as possible
https://photos.app.goo.gl/CdPBLg5AFc3ADaH78
I do not want to use one product like Gyeon Leather Shield, and leave it without further maintenance, because I think that if you want to keep your leather soft it need to be regularly treated by some conditioner. So after reading many reviews I decided to go with Swisswax - just made an order yesterday and can't wait use it for the first time