Now that I have close to 150 miles on the Colnago with commute, flat, and some climbing; although still not that much, but enough to give me some good initial impression.

I am very surprised by what you were told by the bike shop. My personal experience of the Cdale EVO is that it's a great race/climbing bike, very light and lively, but it's not exactly an everyday bike. It's a bit twitchy (with 110mm stem), and on rough roads, you feel the EVO bounces quite a bit and can definitely feel all the bumps in the roads. Even though I don't think it feels as stiff as the Cervelo S3, but the power transfer is instantaneous, e.g. when you get out of the saddle on short punchy hills. The C59, on the other hand, rides very differently from the EVO; the one stands out the most from my first 150 miles is how muted the road feel is: I no longer try hard to avoid some of the imperfect road surfaces that I normally would with the EVO or the S3. The C59 is also more stable on cornering and descents than the EVO, your feel confident that the line you are on will be line you will hold. In terms of stiffness, I don't think it's as stiff as the EVO overall, the power transfer is not as instantaneous as the EVO, feels a bit more sluggish. Overall, the C59 has a bit of the steel bike feel: smooth but feel a tad heavy, while the EVO is a through and through modern light weight race carbon bike.

I hope to put more miles over the holidays on the C59 and see how it does.