STEREO explains the differences between the MK1 and MK2 series and comments positively on IKON 2 MK2's dynamic sound characteristics.
Here's a few quotes from the review critics (translated from Japanese):
Mr. Guyama-san: "The sound is natural for a mid-sized bookshelf speaker. The sound is bright and distinctively light! When you listen to bright music, the experience is lilting."
Mr. Kanzaki-san: "The sound is bright-oriented. Its high frequency area sound is distinct."
Mr. Saito-san: "The cabinet is somewhat big for book shelf type loudspeakers - but the sound space spreads naturally."
And finally, mr. Fujioka-san praises the DALI hybrid tweeter and notes the improvements of the woofer. According to mr. Fujioka-san, the sound is overall brighter in the mid-high frequency area than the MK1.