[Elecraft] Unique synthesizer LO ?

[PE1E]

Maybe not the cleverest question of the year but I cannot resolve this one
myself and I'm eager to understand.

It is said that the synthesized LO of the K2 is of a unique design.
Though, when I compare the LO phase noise specs of the K2 and the AOR7030,
the latter seems to show much better specs.

What makes the K2 synthesizer so special ?
I'd appreciate any comment.

Peter, PE1E