Since I've migrated to Fuji X systems (Fuji XT1 / X100), I've had the need to know the filter sizes to get the necessary rings to fit the filters I want to use! I'm sure you all have the same needs as well! So here is the list of the updated thread sizes for Fujifilms Fujinon XF lens lineup.
Feel free to let me know if there any recent changes or mistakes.

Fujifilm XF 14mm F2.8 R
58mm

Fujifilm XF 16mm f/1.4 R WR
67mm

Fujifilm XF 18mm F2 R
52mm

Fujifilm XF 23mm F1.4 R
62mm

Fujifilm XF 27mm F2.8
39mm

Fujifilm XF 35mm F1.4 R
52mm

Fujifilm XF 56mm F1.2 R APD
Fujifilm XF 56mm F1.2 R
62mm

Fujifilm XF 60mm F2.4 R Macro
39mm

Fujifilm XF 90mm f/2 R LM WR
62mm

Fujifilm XF 10-24mm F4 R OIS
72mm

Fujifilm XF 16-55mm f/2.8 R LM WR
77mm

Fujifilm XF 18-55mm F2.8-4 R LM OIS
58mm

Fujifilm XF 18-135mm F3.5-5.6 R LM OIS WR
67mm