It looks as though the Fujifilm 10-24mm F4 has some new competition. Fujifilm has just launched the XF8-16mmF2.8 R LM WR.
The lens boasts water resistance and a linear motor. The linear motor helps the lens focus with little noise and far more accurately than conventional motors. Fujifilm have also said “it’s world’s largest wide angle as an interchangeable lens for a digital camera with brightness of F2.8 maximum aperture throughout the entire zoom range”