Merrill Taranis vs Wyred4sound ST-500

I'm looking for a replacement for my Gen 1 Wyred4sound ST-500. I'm playing exclusively digital flac through an exogal comet to PS Audio BHK preamp. Speakers are Ohm 5000. I'd prefer to stick to class D for efficiency and a stereo amp due to space limitations (large room, but it's not all mine if you know what I mean). 

I'm considering a Merrill Taranis. If anyone has experience with both these amplifiers I'd like to know how much (or if any) improvement I can expect replacing the Wyred with the Merrill. Is it worth making a change?