I believe it was Kanta 2. Notes started and especially stopped with a speed that was noticeable. The dealer remarked that this is similar to electrostats. Lower mid range and upper bass were a little lean IMO , but this did contribute to a transparent and detailed character. The Contours had a more even bass response and pressurized the room to a greater degree: although they probably need to be played louder and with more power to come alive than the Focals.
I didn't find the beryllium tweeter edgy or hard (which I've experienced before) but perhaps cooler and drier toned than the Dynaudio's. More detail information, but whether this is more natural sounding than the Esotar will be a matter of personal preference and system matching.
That same visit I also compared the C1 to the Sopra 1 in another room. Similar impressions, but the Sopra 1 had a level of refinement and ease that was VERY appealing.
I would want to use a subwoofer with it, definitely more so than the C1.