Its pretty impressive but its worth to point out that its mostly a pre-merge hype. After its done, after "buy rumours sell facts event" and spectacular dump, bitcoin will come back on top once again.
Exactly as you said that after the merger event is over Bitcoin will again outperform ETH and it is proven even now if we see the price of ethereum coin has dropped to the level of $1.2k and has returned to rank 2 in the market, when the pre-merger Hype came in the price of etherum coin had touched the level of $ 1.7k but it was only temporary and it's only natural that at that time the trading volume of ethereum coin could outperform Bitcoin.