I have actually owned all three with a slight variation. My Sonatas were V2 not the V3's.
To my ears the Bolero is a good measure better then the others listed.They are my current speaker also.
They are more refined then the Sonata and play music with a more natural tone, ease and grace.They are stunning in every way.
The Bolero will never fatigue no matter the volume and are more full bodied and rich.
These comments are all the more true vs the Gallo.
The Gallo's also sound smaller, much smaller.
The Gallo lacks the weight, body and control of the Bolero. The Bolero is warmer sounding, but just as transparent.
The Gallo has a more immediate sound and perhaps more open.
Feel free to email me directly should you desire to talk etc...