Yes. I don't think that a higher input impedance is a advantage. Sorry! I want to mean that distortion only decrease a litte if CFP LTP input is used.
From simulation, I known this for very long time but I'm not sure. I have just read Self's book. Oh! Sefl is a talent man
He know what I want to say 
Well, really boils down to your requirements and design. C and D are cascodes, both bootstrapped to the tail. Traditionally you would have an external voltage reference but as one article by Edward Cherry in WW points out, the emitter signal voltage fluctuations result in distortion at high input voltages, or in amplifiers with low input sensitivity.
Traditional cascodes are better suited for CE or gain stages because your emitter is referenced to either of the voltage rails depending on device polarity and not left floating (like a virtual ground) in case of ltp.
Traditional cascodes are better suited for CE or gain stages because your emitter is referenced to either of the voltage rails depending on device polarity and not left floating (like a virtual ground) in case of ltp.
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