Interesting your take on the IS350 versus the 135. I do like the IS350 which my friend has (and my boss has an IS-F that I've driven) and I find the IS to be softer and less connected to the road than my 135 vert and so does my friend. It's especially true when you push it to the limits in my opinion.
2014 EBII 435i xDrive M-sport
Gone: 2011 TiAg F25 X3 xDrive35i M-sport
Gone: 2008 TiAg w/Coral Red E88 135i Cab M-sport