Polkadot offers better scalability than the ethereum blockchain. It offers relay chain, cross-blockchain features, forkless network, decentralized governance and all these are not available in the ethereum network. Actually, Polkadot offers all the solutions to those problems that the ethereum network can not. So many projects are using the Polkadot network. Do you think Polkadot is really Ethreum killer?
Can't you compare Polkadot with EOS or NEO? Can't you put them head to head instead of using Ethereum, Polkadot haven't beat Tron or RSK yet you are now using Ethereum to compare, let's save this for another way when or if Polkadot manges to beat Tron, EOS, Neo, and others first