Exactly, you should compare a review with one of the units you own yourself. I think the example of the GR07(Bass) is a good one to show what bass body is. The X2 also has full bodied bass, like the LCD2, etc.
Yeah, I reported it with the L5Pro as well. Some days it's a good playlist, other days not so The Cayin N5 shows the same behaviour, I can't say it is noticeable that much with any of my other players (about 15)