Yes, LM805ia is in a whole other league than the PL amps. As you say, it's so obviously beyond the realm of A/B comparisons. It definitely gets my vote for best integrated under $6000.
Not at all surprised by your listening impressions of the two amplifiers. One is a solid/competent class AB push pull design utilizing indirectly heated pentode tubes. The other is pure class A, simple SET circuit utilizing directly heated tubes (DHT) with natural and emotionally involving palpable sound. Two different levels of amplifiers.
Agree with Silverlakejim, had a Prima luna dialogue premium, and even with KT-150, the LM 518 is in a different place sonically,especially with very efficient speaker like rethm maarga...👌
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