Viltrox af 135mm f1.8 lab £719/$599

LENS TEST

LENS TEST

Zoom lens Sony FE 28-70mm F2 GM

Zoom lens Fujinon XF16-55mm F2.8 R LM WR II

£2,899/$2,797

Sigma’s full-frame mirrorless camera is by far the most interesting camera of the year, but does it really make any sense? Andy Westlake finds out