Orpheus,
I dont know whos review or what model of Sota Sapphire or upgrade Rega you are referring to, but I have owned a Sota Sapphire III and Rega P3, both using RB300 arms and the Rega isnt in the same league, not by a long shot, whether you are comparing bass, quietness, speed regulation, isolation from external vibrations, PRAT or any other item. Its just a better made and performing turntable. Have you actually owned and compared both?
I dont know whos review or what model of Sota Sapphire or upgrade Rega you are referring to, but I have owned a Sota Sapphire III and Rega P3, both using RB300 arms and the Rega isnt in the same league, not by a long shot, whether you are comparing bass, quietness, speed regulation, isolation from external vibrations, PRAT or any other item. Its just a better made and performing turntable. Have you actually owned and compared both?