The Nikon Z8 outperforms the Lumix S5 II in resolution and autofocus per DPReview and DXOMARK benchmarks, making it the stronger choice for stills professionals. The S5 II excels in video features and portability, beating the Z8 on price accessibility according to CNET and Wirecutter comparisons. This is a close call for hybrid shooters but the Z8 wins overall for image quality.