Parsifals vs Mahlers - best for what I got?

Friends, a few responders to my querie on high WAF speakers suggested, among many, the Parsifals and Mahlers. They are both handsome and may bring peace - if not calm - to our listening area. As I can audition neither, would appreciate your thoughts. The room is large - appx 25'x25' with a cathedral ceiling reachng to 18'. The room is sunken and opens into the rest of the house. Placement of the speakers would be along the rear wall facing into the rest of the house. I think the spousal "line in the sand" will be about three feet from that wall. No limit on side wall on one side, andd about three feet on the other. I have new power - Halcro MC20 (400wpc) and Atmasphere MP-3. Old power is Pass Aleph 5 (60wpc Class A)and Blue Cirlce BC 21. I bought the Halcro/Atma Spheres for my Newform Research 645 hybrids, but would use the new gear with the new speakers if need be. New front end is Cambridge Audio 840c. Listening preferences - acoustic, ensemble jazz, Grisman, Wasserman, Hancock,etc. Looking for faithful reproduction of tonality with little color - and what everyone wants - large soundstage, presence,etc.
I'd appreciate hearing from anyone who has auditioned or even lived with both. Thanks in advance.