Hello, has anyone had the opportunity to a/b the Genz and the new GK yet, preferably into the same cabinet? What are the differences? Tone? Sound quality and variety of tones? Volume? Also, wondering how the MB2 compares to the Fusion 550. I know they are totally different designs, but I'm mainly wondering if the MB2 sounds as robust as I would expect the Fusion to sound with tube pre and toroidal transformer. I haven't heard either one or been able to a/b them. Thank you.