Sony Xperia Z2 maximum supported write/read speed for MicroSD Cards

I am looking to buy one microSD card for my Xperia Z2 Phone (6503). My question is: how fast it can write data to an SD card. For what I know, these speeds depend of SD Card controller. If I will know approximative numbers I can acquire adequate microSD card. Right now I am trying to decide between: SanDisk SDSDQX-064G-U46A Extreme Plus 64 GB - 80 MB/s SanDisk SDSDQUA-128G-G46A Ultra 128 GB - 30MB/s Writing speeds for these microSD Cards are half of indicated reed sped numbers. I like 128 GB capacity of Ultra Card, but will not hesitate to buy faster 64 GB Extreme Plus Card.
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If you use 4K recording like features, you might need to get a high speed SD!(go for the Maximum speed you can)
So I think Extreme plus would be better in this case, but if your phone is everything for you (just like me) use the maximum capacity (Which has a better speed as well, otherwise useless) I use a class 10 128 GB!
As far a I know, I think even 30 MBP will be enough for a 4K video!

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Sony Xperia Z2 maximum supported write/read speed for MicroSD Cards

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