I own some So Kate 120s, Pigalle Follies 120, one old-cut Pigalle 120, Decollete 554 100, Anjalina 100, Pigalle Follies 100, Iriza 120, Pigalle Plato 120, Bille et Boule 100, Geo 100, Filo 120, New Simple 120, Cross Blake 100, Dorissima 120, Pigalle 100.
My most comfy pair of CLs are the Pigalle 100 black kid. I can walk miles in them. The New Simple 120 are quite comfy too, I guess it´s because of the small platform, it makes them feel more like a 100 than 120. Same goes for the PP 120. When it comes to the 120s without a platform, I love my old-cut Pigalle the most, I guess it`s because I wear them a lot and they are perfectly broken in.
My most uncomfortable CLs are the SK. It´s not impossible to walk in them, I have 10 pairs and I wear them often but they have a longer break in period than my other CLs such as PF or PP. More comfy than the patent SK are my kid SK and the cork chevron because the material is softer and more forgiving than the patent.