Heat/Thermals in 15'' Retina Macbook Pro 2.3 vs 2.6? (Is it "Lap-pable")?

[Starfyre]

What is the heat like for the processors in the 15'' haswell retina macbook pro? Could anyone post their temperatures and processor at varying loads?
Is it cool enough to use the machine for extended periods on your lap?

 

[aixki]

What is the heat like for the processors in the 15'' haswell retina macbook pro? Could anyone post their temperatures and processor at varying loads?
Is it cool enough to use the machine for extended periods on your lap?

It would be interesting in comparing heat in the 15" haswell retina base model (iris pro only) and high-end model (dedicated gpu + iris pro).