Lyra Delos vs. Kleos?

Sonically the Kleos is a downgrade but you won't notice it because you spent more money and your brain expect a better performance. Kleos is a good choice for a very analytic, thin, harsh sounding analog rig or for average Phonostages which can't show big differences. It is smooth and has a very soft high frequency area. It is also silent in the grooves. Great for noisy Reissues.
Delos is better for someone who is looking for real Performance with a very good analog System. Normally it should be sold for 6k and the Kleos for 1.5k.
That's high End.
But don't be confused, you will get a lot of confirmations from happy Kleos owners who think it is a great cartridge :-).
Lyra has some outstanding ones (or had), but not each one is among them.

Lyra Kleos in action

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In a way it doesn't matter. Most components in a System need compensation among each other. And most users want to spend money, the ability to understand what is going on has absolutely no connection to that. MP3 became a huge success and it is only logical that it will be available in a cartridge design sooner or later. There is a System out there somewhere that's the ideal match for any cartridge.