Here is the difference between two tt setups. The AF1P and AS2000. Variables are only on arm/cart combo. AF1P with MSL Plat/Axiom. AS2000 with Opus1/SME. I now listen to AS setup 95% of the time.
Can you check the levels of these two recordings? Unfortunately it seems to me this is a very unfair comparison - as far as I see the levels are not the same, probably because one cartridge has higher output than the other or some settings or microphone position are different. It seems to me that the AS2000 is louder enough to sound fuller and compromise the value of any comparison. Curiously the specifications would suggest that the MSL plat has higher output than the Opus1, enough to prevent any direct comparison. BTW I checked levels with a sound-meter placed inside the phones - a software analyser would be preferable.
It is known that variations in level down to .2 dB are enough to bias comparisons. It is why I always take immediate comparisons made without proper measurements with tones of salt. The specified difference between the two cartridges is .9dB.