Kakaku member, Barclay1234, published a fabulous report (in Japanese) detailing the write speed of the X100T with various SD cards. His methodology:

Camera settings: MF
Exposure settings: 1/1000 sec.
ISO 3200
drive: HI, LOW

Contemporaneously, the shutter button was tripped and a stopwatch was set. When the stopwatch read 15 seconds, Barclay1234 removed his finger from the shutter button. He then counted the number of files, including files that may have slipped in after the stop watch was tripped, that were recorded. (Barclay1234 admits that the numbers won't be 100% correct. They should be used as guidelines, only.)

If I understand correctly, the numbers are read like this:

HI (# recorded pre-slowdown) (# recorded post-slowdown) (total recorded)
LOW (# recorded pre-slowdown) (# recorded post-slowdown) (total recorded)

These are the results of his test:

X100T
SanDisk Extreme PRO SDXC UHS-2 64GB
HI　　7　　12　　19
LOW　　8　　12　　20

SanDisk Extreme PRO SDXC UHS-1 64GB
HI　　　7　　22　　29
LOW　　10　　20　　30

SanDisk Extreme PLUS SDXC UHS-1 64GB
HI　　　7　　18　　25
LOW　　10　　15　　25

#4　Lexar Professional 600x SDHC UHS-1 32GB
HI　　　7　　13　　20
LOW　　　8　　12　　20

XT-1
For reference: X-T1 & SanDisk Extreme PRO SDXC UHS-2 64GB
HI　　20　　28　　48
LOW　　46　　-　　46

The X-T1 experienced no slowdown in the first 15 seconds. 46 JPEG+RAW files were recorded. After 60 JPEG+RAW files recorded (only 19 seconds after the shutter was tripped), slowdown was noted.

The cards used are the below:

1番　SanDisk Extreme PRO SDXC UHS-2 64GB
UHS-2 write speed　280MB/s(1867x)
UHS-2 read speed　250MB/s(1667x)
UHS-1 (no explanation)
Made in Japan

2番　SanDisk Extreme PRO SDXC UHS-1 64GB
read speed　95MB/s(633x)
write speed　90MB/s(600x)
Made in China

3番　SanDisk Extreme PLUS SDXC UHS-1 64GB
read speed　80MB/s(533x)
write speed　60MB/s(400x)
Made in China

4番　Lexar Professional 600x SDHC UHS-1 32GB
read speed　90MB/s(600x)
write speed　45MB/s
Made in Korea

Barclay1234's conclusion is this: When used in conjunction with the X100T, the UHS-2 Sandisk Extreme Pro returns roughly equal results to the Lexar Professional 600x card, and therefore, incongruent with its price. In contrast, the Sandisk UHS-2 card returns amazing results when used in conjunction with the X-T1.

Thank you, Barclay1234.

Source: X100Tに最適なSDカード