All of the CryptoNote coins do (Monero, Boolberry, Bytecoin (BCN) etc.) They have working anonymity from their launch. If you take Bytecoin's claim at face value (it's pretty clear it's bullshit) they have been around for 2 years. Even knowing that it's likely a false claim meant to cover up their 82% premine, you still come face-to-face with an indisputable fact: Bytecoin's first commit to github was on 15 November 2013, and already then the code worked and provided cryptographically untraceable and unlinkable transactions. Monero, too, was launched (fairly) on 18 April 2014, before XC even came into existence.

As much as I think Bytecoin is a fail because of their premine, they are the ONLY ones that can lay claim to having the FIRST "working anonymity". Monero and the all the other CryptoNote coins can lay claim to being the ONLY cryptocurrencies that currently have a 100% working solution to cryptographically untraceable and unlinkable transactions.

If you don't believe me, pick any transaction on the Monero blockchain (eg. http://monerochain.info/tx/49ee290a4e65bc554382089d778c1ac26b20a5b6044d3fa4b1767780e2617546) and try figure out the address of the person that sent the coins, the address of the person they were sending to, and they amount. I'll gladly even setup two wallets and transfer between them and give you the transaction ID to give it a try. Oh and these transactions are instantaneous, no waiting for a mixing hop to finish or anything.