very intelligent analogy from aptly named nothing but time.
Using the same, i see the comparison more as one of 'e-class merc against e-class merc' as both are pateks 'rather than merc vs honda'. the only difference that a true newbie like me could see is that one merc has manual gear (annual calender) & the PC has auto gearbox. however, the manual gear box merc has a power indicator , the auto doesn't .
and you can buy at least two manuals for price of the auto!
The AD tells me that same amount of metal goes into both; i presume craftsmanship is at its zenith in both, & perhaps the 5146 dial looks slightly 'tidier' to me.