So in the medical field and have worked on the cruise ships ( Sun Princess ), and have a friend and colleague who was Snr Doc on Ruby Princess when they had their outbreak and was screwed over by the Aussie authorities - so have quite an intimate knowledge of the scenarios.
Cruise ships are notorious for viral epidemics - norovirus and influenza. And therefore had policies and practices already in place a long time prior to Covid, so I can assure you there was a lot more than "basic sanitation" going on on the Diamond princess.
No sure where that R0 came from but a R0 of 14 would have burnt through everyone on that ship very quickly.
I have found this which sounds more reasonable?
"The Maximum-Likelihood (ML) value of R0 was 2.28 for COVID-19 outbreak at the early stage on the ship. The median with 95% confidence interval (CI) of R0 values was 2.28 (2.06-2.52) estimated by the bootstrap resampling method. The probable number of new cases for the next ten days would gradually increase, and the estimated cumulative cases would reach 1514 (1384-1656) at the tenth day in the future. However, if R0 value was reduced by 25% and 50%, the estimated total number of cumulative cases would be reduced to 1081 (981-1177) and 758 (697-817), respectively."
The median with 95% CI of R0 of COVID-19 was about 2.28 (2.06-2.52) during the early stage experienced on the Diamond Princess cruise ship. The future daily incidence and probable outbreak size is largely dependent on the change of R0. Unless strict infection management and control are taken...
pubmed.ncbi.nlm.nih.gov
The image of the epidemic curve gives credence to your suggestion that perhaps we need to wait another week until comparing the outbreaks.
EDIT: Just to add whenever we talk about asymptomatic infection, just a caveat - it usually refers to asymptomatic at the time of testing, often in these type scenarios they are really presymptomatic.