Dear
@thekong I'm not sure if any absolutely neutral cartridge really exists or not. IMHO all cartridges have a sonic signature and most of them are very good. It's hard to tell which cartridge is neutral but I can tell you which is not neutral.
- Swiss EMT, Xquisite cartridges have a bright, tipped up high end without being harsh. Old (before 2015) German made EMT TSD cartridges sound totally different with no brightness at all.
- Ortofon cartridges also have a bright sonic signature sometimes being harsh.
- ZYX is the opposite of Swiss EMTs by being very dark and solid.
For my ears EMT, ZYX and Ortofon are lacking enjoyment beyond tonality. You can balance tonality even if it's bright or dark by matching SUT, cable, phono etc but I'm not sure if it's possible to make them enjoyable. For example vdH cartridges can be bright depending on the sample but they're more enjoyable in my opinion. Audio Technica is also famous with brightness but incredibly enjoyable with extremely high value.
I don't know if Air Tight, TechDas, MSL, Benz Micro (with low SRA around 91), Kondo (on a Kondo setup) are neutral or not but they tick all the boxes. I feel same kind of rightness on their sound just like when I first heard Shure V15 Type III on SME 3009 years ago.