slab, this quote from The Absolute Sound review of the SabrinaX pretty much mirrors my experiences and preference:
"Let us discuss setup and equipment matching a bit before we turn to the SabrinaX’s sonic attributes. The speaker has an 87dB sensitivity and a 4-ohm nominal impedance, with a minimum of 2.6 ohms. My Naim Uniti Star all-in-one (70Wpc into 8 ohms, not specified but probably around 110Wpc into 4 ohms) ran the SabrinaX without issue. From a power standpoint, the Wilsons never sounded starved or fell apart, even at loud listening levels. Yet, when I shifted to the Dartzeel CTH-8550 mk2 integrated (what a combo!), with its 200Wpc into 8 ohms and 330Wpc into 4 ohms, the speakers came alive! As much as the quality of the Dartzeel’s sonics obviously had to do with that, the SabrinaX’s thrived on the added power and control."
Wilsons have a reputation for excellent dynamics and a 'liking' for power. Back in the day, I had 86dB efficient Aerial 10Ts driven by a Mark Levinson No. 331 (rated at 100 watts, 8 ohms; 200 watts 4 ohms) - all I could afford at the time and sounded fine, but the 10Ts clearly wanted more to sound their best.
This hobby is all about personal choices, so as always, YMMV!