You're lucky, ticking the box in CS5 does a grand total of absolutely nothing, it has no effect at all.
Maybe it's the engineer in me but I don't buy into the Leica look or that these are things are somehow magical and escape definition. The look a lens gives is a fundamental result of the design and materials used and we should be able to describe what we're seeing and perhaps even begin to understand why. For example in recent years we've seen Sigma do something different with lenses under corrected for aberrations and we've seen the results and I have my Voigtlander lenses which share some of these properties and I'd guess that Fred Miranda is pretty much spot on when he speculates that Sony went for resolution and contrast and spherical aberration correction. Again, this doesn't involve magical fairy dust it's just result of the design decisions made.
I don't see the Sony 35mm f1.8 as flat at all, not from a colour and contrast point of view but I do think that the rendering could be better but if it was maybe something else would have to give. I tend to take a lot of pictures with messy backgrounds and these will not be ideal for showing off the bokeh of 35mm lenses and I do have worse rendering 35's than the Sony f1.8 but I've also read several reviews which praise the Sony f1.8's bokeh. If you can bare to look at photographs of beautiful women take a look at what Manny Ortiz does with the Sony f1.8.
I agree with a lot of what's said here...
Review of the Sony FE 35mm F1.8 which covers real world use as well as in-depth technical analysis and contains many full resolution samples.
phillipreeve.net