Actually, BTC is now holding the 15th position, just below and within reach of JP Morgan (see
https://assetdash.com/),
The word "assets" is a bit misleading, that's the equity, JPM has 3.2 trillion in assets.
There isn't much we can compare it to, which is a shame when comparison is a useful method to help people understand scale.
Best it's to compare it to things like itself, that will be...eth, and
BTC is already 6 times bigger.

But really, those kinds of comparisons will always have flaws, been companies of the same business type have misleading valuations, based more on the possible value than the actual value or the number of clients or assets or anything else, Tesla is one of those, for example, one out of hundreds.
The scary part about it is that there are some useless coins that have a bigger market cap than companies with a solid business with dedicated customers and a known brand behind it while most of all those coins will be gone and dead in a few years.