Not really. At least e-commerce has a pretty capable incumbent (Shopify).
CMS is an interesting case, though. There are 4-5 companies trying to take on WordPress. I could go with the incumbent, but I'd love -- LOVE -- some real dev reviews of that stuff.
Like, where's the fucking unboxing video for developer software?
The top three ecommerce platforms are all Java based (hybris, Oracle ATG and IBM Websphere) and there are a ton of "tier 2" platforms that are cover the .net and PHP stacks.
The tier 1 systems will cost you a significant amount of money to get up and running though (over a million $ is not uncommon).
If you only know of the PHP platforms then I guess you don't play at any significant level in the industry (like most people on HN).
Right now, the only mature ones I know of are all PHP based :/.. I hope that's just me missing something though.