I'm going to piggyback Paraneer's recommendation - you have to hear these in person because they're very different.
I just did a dealer demo of the Olympica III and B&W 802D3 (not the 803, but close enough) last weekend, both in the same room and both with McIntosh gear, and they have different sound signatures. They're both really nice, of course, but different. I wouldn't consider them interchangeable, even though I could happily live with either. I will say that just from what I heard, in that particular room, if I was mainly a rock listener I wouldn't choose the Olympica. It was glorious with acoustic music, but for rock music I'd choose something else.
I just did a dealer demo of the Olympica III and B&W 802D3 (not the 803, but close enough) last weekend, both in the same room and both with McIntosh gear, and they have different sound signatures. They're both really nice, of course, but different. I wouldn't consider them interchangeable, even though I could happily live with either. I will say that just from what I heard, in that particular room, if I was mainly a rock listener I wouldn't choose the Olympica. It was glorious with acoustic music, but for rock music I'd choose something else.