In both China and Italy, confirmed cases started to fall 2 weeks after lockdowns. But in China they fell much faster. This suggests that Italy's lockdown hasn't been as effective as China's. 
Note that a lot of people are saying "China's data is fake", but they haven't thought about it very hard. In order to distort the *speed* with which cases fall, China's data tampering would have to be smoothly time-varying. Seems less likely.
I see the "China fakes its data" meme has utterly poisoned people's ability to think rationally about how to extract information from any Chinese data. Comments are a dumpster fire of I-haven't-thought-very-hard-about-this-ness.
