Need your help.

I currently use a Pentax K5 with a Sigma 18-35mm lens and I'm happy with the results.But I 've been trying to learn about full frame digitals and now I'm somewhat confused.Should I get a FF Canon 6D with a 24-105 lens or stay with my Pentax/Sigma setup.My main interest is quality.I shoot landscapes and I like the 20.2 mp's.I don't want to sell my Pentax setup for a new Canon setup if the quality isn't going to be that much different.I understand about the extra angle of view you get with a...

Need your help. Need your help.