With a DxOMark lens score of 19 points, the new high-grade zoom lens is ranked in joint first place alongside the Panasonic Lumix G X Vario 12-35mm f2.8 ASPH Power OIS, but comes second to that slightly more-pricey model in average sharpness  (with a score of 9P-Mpix).

Panasonic LUMIX G X VARIO 12-35mm / F2.8 ASPH. / POWER O.I.S.11291910
Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 PRO1000199
Panasonic LUMIX G X VARIO 35-100mm / F2.8 / POWER O.I.S.13001810
Panasonic Lumix G Vario 7-14mm F4 ASPH11001510
Olympus M.ZUIKO DIGITAL ED 9-18mm f4.0-5.6700149
Panasonic LUMIX G VARIO 14-42mm / F3.5-5.6 II ASPH. / MEGA O.I.S.245147
Panasonic LUMIX G X VARIO PZ 14-42mm / F3.5-5.6 ASPH. / POWER O.I.S.399136
Olympus M.ZUIKO DIGITAL ED 14-42mm f3.5-5.6270136
Olympus M.ZUIKO DIGITAL ED 40-150mm f4.0-5.6236137
Panasonic LUMIX G VARIO 45-150mm F4-5.6 ASPH. MEGA O.I.S.300136
Panasonic LUMIX G VARIO 14-140mm / F3.5-5.6 ASPH. / POWER O.I.S.920137
Panasonic LUMIX G VARIO 100-300mm/F4.0-5.6/MEGA O.I.S.600126
Panasonic LUMIX G X VARIO PZ 45-175mm / F4.0-5.6 ASPH. / POWER O.I.S.383126
Olympus M.ZUIKO DIGITAL ED 12-50mm f3.5-6.3 EZ499125
Olympus M.ZUIKO DIGITAL ED 75-300mm F4.8-6.7 II550126
Olympus M.ZUIKO DIGITAL ED 75-300mm f4.8-6.7800105
Panasonic LUMIX G Vario HD 14-140mm F4.0-5.8 ASPH850105
Panasonic LUMIX G VARIO 45-200mm f/4.0-5.6 MEGA O.I.S.255105
 

Out of the standard zooms, unsurprisingly the new Olympus model is a far superior model but even the more modest lenses perform very well optically.

Panasonic LUMIX G X VARIO 12-35mm / F2.8 ASPH. / POWER O.I.S.11291910
Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 PRO1000199
Panasonic LUMIX G VARIO 14-42mm / F3.5-5.6 II ASPH. / MEGA O.I.S.245147
Panasonic LUMIX G X VARIO PZ 14-42mm / F3.5-5.6 ASPH. / POWER O.I.S.399136
Olympus M.ZUIKO DIGITAL ED 14-42mm f3.5-5.6270136