The Harbeth C7ES-3 XD2 are a very good speaker. It would help if you mentioned the other components. Synergy is very important, particularly amp with speakers. I owned a pair of Harbeth M30.2 40th anniversary. They were fantastic with vocals, midrange and soundstage, especially when I put them on Ton Trager stands.
Like you I decided to do a significant upgrade. I traded to the Dynaudio Contour Legacy. Likely my end game speaker. I had listened to the Devore O/96, which are also a top choice. (Much better than the Fleetwood Deville that I compared side by side by the way). But my room was not large enough (room size also matters when you pick speakers). Another pick would be the Perspective Graphene. Again depending of your amp and other component matches. Good luck and keep us posted.

