No. Do not listen at legends :p
Yes, I doubt Sigma would spend a fortune in R&D to bring a camera to market that has worse image quality than the one it replaces. There's no reason to stick with a Foveon sensor, and all that issues that entails, if it doesn't bring along the traditional Foveon benefits.
Every time a new sensor with a smaller pixel pitch is announced from Canon or Nikon, the howls go up about how smaller photosites will lead to more noise. But does anyone then find noise problems in photos from those new cameras? How many out there have abandoned their D800s for older, lower-res cameras?
My point is that we're on the very left side of Roger Cicala's "Law of New Product Introduction" (
http://www.lensrentals.com/blog/2013/12/a-bit-of-a7r-sanity) right now for the Quattro cameras. They may prove to be terrible, or fantastic. But let's wait and see which it will be before we make our pronouncements. Personally, my guess is that they'll be better in just about way than the Merrill generation, but I have nothing but vague hopes to back that up.