The Nikon Z8 leads with its 45.7 MP full-frame sensor and 8K video per CNET and RTINGS data, beating the OM-5's 20.4 MP Micro Four Thirds on dynamic range by over 2 stops. The OM-5 excels in weight at 414 g versus 820 g but trails in low-light AF consistency. This is a clear win for the Z8 in demanding scenarios.