Primaluna Dialogue Five vs. Seven vs. MC 275?

I am curious if anyone has a basis to compare these. I know the 275 and the Dialogue Seven are more similarly powered, and wonder how they compare to each other, but also wondering if given a fairly efficient speaker, if the Five is close to the Sevens and/or the 275 in quality?
Please look into and listen to the Cayin knockoffs of the MC 275. Great sound and value. Cayin and Primaluna are made by the same firm in China.