Wilson Audio Sasha 2 vs Sophia 3

I have never owned any of these but have heard all 3 several times. 

The sophia 3 is MUCH closer in sound to the Sasha 1 than the Sabrina. At the going rate they would be my #1 choice but for a few grand more you could get a used Sasha. The adjustable head really helps with setup. 

Honelty I thought the sabrina was just average....  It lacked the bass power that makes the Wilsons for me. 

George,

Thanks for the link. I did read that review.  I've also ready so many comments about how well the Sashas play with Ref75, but perhaps I should consider the Ref150.  I did notice a huge dip ~2ohms creating a very significant gap/phase angle from ~100hz and for quite some time up the audio band.   I'll keep you all posted on how they sound. 
Thanks again for all the input. 

I have Sasha 1 with Ref 150 ( KT 150 tubes). No problems driving the Sashas. Back when I had the Ref 110 amp, I brought the Ref 210 monos in house to see how much better they would do with the Sashas. At the time, it was about 10% (mainly in dimensionality and imaging) with no appreciable difference in the low end.
Based on that, I’ve always felt the 150 WPC amp is best bang for the buck with the Sashas. That said, I’ve never heard the Ref 75se with Sashas although I’ve heard the Ref 75se vs the GS 150 with the Alexias. It was no contest. The GS 150 drove the Alexias very well in all respects while the Ref 75SE drove them in a merely satisfactory way. Hope this helps.

No problems driving the Sashas. Back when I had the Ref 110 amp

Yes, but the Ref110 has double the amount of output tubes than the Ref75, 8 instead of 4.

The Ref 75 may sound fine, even in the bass/upper bass to the unwary, but when an amp with current is compared to it, then one will hear what it's not doing right in the bass/upper bass.

Cheers George 

How can you really tell how much current an amp has.  All that is published is the watts, typically.  I know "not all watts are the same" - which I've always interpreted as some have more current/guts than others...  Can anyone point me to a layman explanation AND a way to tell how much current a given amp has?  Thanks!