Knowing what you like sounds "subjective". My position is "No" is a cop out. In this hobby you must listen....whether you listen well and have learned or not, or you don't trust your judgement is nothing to be ashamed of. There are many tin ears in this world.
My position is that "no," in this context, is a recognition of the very real impact bias can have on perception. If you're not talking about subjective judgement, what are you trusting your ears to do? To identify distortions? To hear variations in linearity, dynamic range, imaging generated by electronics or wire? To differentiate between very small differences in two pieces of equipment?
Have you tested and verified that trust? Or are you simply sure you hear which one is "best," when the choices are right before your eyes?
Tim