Voigtländer 15mm f/4.5 super wide-heliar z aspherical

LENS TEST

LENS TEST

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

Zoom lens Sony FE 28-70mm F2 GM

£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