Ethereum is not created with a vision to be used as a currency, Bitcoin is. Ether a token on Ethereum network was in whitepaper created to be used as a fuel for running smart contracts and apps on Ethereum blockchain, there is no fixed supply of Ether. It is not created to be store of wealth like Bitcoin, which has a fixed supply of 21 million coins, Ethereum can be created infinitely.
There is no sense for Ethereum in its intended use to compare value and market cap with Bitcoin. Its a bubble.