I have the Ultra and spent some time with the EX before that. I very much enjoyed the EX, but when I had the chance to hear the Ultra in my system, it was not a hard choice. The Ultra adds better clarity and extension. The bass is more extended and controlled. I would not call either cartridge "lean" but they may seem that way when compared to a Koetsu. The resolution, particularly in the upper mid-range and the higher frequencies was better with the Ultra. The sound stage and the instrument detail were notably better as well. I think the EX is an excellent cartridge, to say the least, but the Ultra sounded just a bit better all around in my system.
