Well, to the best of my knowledge M805 and it later iterations are not used in any recording studio as they offer no advantage over its more rugged professional cousins. What's the point of a small passive speaker in expensive drag clothing in a recording studio?

And to your question, I would expect an AN E(though I have not heard it) to have more bass and dynamics than an M805 (or later variants) as its much bigger and has much larger cone area. The measurementd confirm that, same the J to a lesser extent. The N805 (and its variants) is a small speaker with a small woofer and relatively high sensitivity @88dB and measurements show a falling response from 120Hz downwards and when I listened to an older N805 iteration, it was no bass excavator to my ears.

Do I think that the AN E and AN J are capable of producing the lowest registers of a Piano? Well, I believe the AN E would do it in the right room (the upper bass it still likely to sound tad lean though). I am not too sure the AN J can manage it as it would have a much higher -6dB point.