The main similarities are the Arabic numerals and case style. Mark XX is on the smaller size of 40mm, the Zenith case style is more bold. IMHO The El Primero is superior on the inside, but the Mark XX bracelet takes it on the outside.I like the straps on the Zenith, I would buy a bracelet if they offer the option.
The lume is better on the Zenith, I wish they put lume in the numbers on the Mark XX.
Aesthetically these offer great choices. Black, Blue, or Green on the Mark XX or black or stainless steel cases on the Zenith. I feel the Zenith dial edges out the Mark XX. I like the ridges, I like the floating hands, the high beat movement has the second hand look almost like a Grand Seiko Spring drive. Having owned both, you can’t lose with either.
Regarding the IWC Chrono41, I had the blue, the blue with bronze case, and have the green dial bronze Spitfire now. Very comfortable watches. 41mm is a good size. You want to try them before you buy of course, these are good money, you want to make sure your happy in the end.
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