I owned the 07x | LA4 + HPA4 | Holo Serene preamp | Schitt Mjolnir v3 at one time and paired it with the CODA #16. Actually, the 07x may have been paired with the CODA #8. A bit of a blur now.
The 07x did not have the detail that the LA4 and the Holo Serene provided me. It was also noisier than those 2 and I could hear noise on very quiet passages. Once I heard that I always focused on that so the 07x had to go. A lot of people on here have said I am crazy with that observation.
My 07x was rebuilt by Doug at CODA due to this issue since it was noisier than the dealer’s unit. We had them side-by-side and compared. However, even after Doug replaced every single component on my 07x, except the case, I still found it lacking in comparison to the LA4 and the Serene.
The LA4 is indeed not holographic and will not add to the sound. However, my speakers have a bit of warmth and that is all I want. If you want a bit more warmth from your preamp, the Holo Serene will provide a bit more than the LA4.
A good way to figure out if you like the LA4 is to do a 30-day home trial from Benchmark. The Serene is almost identical sonically, except for a bit more warmth.
My Schitt Mjolnir v3 is a Class A preamp and it is rather good, better than the 07x for me. It has no remote and is very warm. I do not like it paired with the #16, It is too much of a good thing, but I think a lot of others would like it over the LA4 and Serene paired with the #16.
The thing with the LA4 and Serene is that the other components really dictate how your system will sound. For example, the CODA #16 system is not that great with the warm-ish Schitt Yggi+ LIM DAC. However, it is amazing with the more neutral Yggi+ OG DAC.
BTW - I mistakenly thought your amp was the CODA #16. I had the NAD M22 v2 in the house for 30-days paired with the LA4. I hated the sound and luckily was able to return it.