Yeah, and besides, my tone varies from day to day. It might be my fingers feeling different, the strength of my picking hand, the strings aging, the humidity in the air, or it might be dwarfgoblin-people sneaking in at night to change my amp settings, I don't know. Point is, a complete unbiased comparison is virtually impossible. But if you listen to enough, you WILL learn to hear the common characterics of the different pickups.
And +1 on the staff.