T3i to 1-D Mark ii a smart buy?

[Markfinn]

I am considering upgrading from my Rebel T3i to a 1-D Mark ii, but I wanted to get some feedback as to whether or not that's a worthwhile upgrade. In case it matters, I would classify myself as an advanced amateur, and a semi-professional. The photo quality of the T3i is quite impressive, but the color replication is inaccurate at times, and the ISO gets noisy around/above 800. I'm looking to upgrade primarily because of the issues with color replication and noise, but also for the 1.3x crop factor sensor and the increased control over features/options. (I always shoot on full-manual, but having only one click wheel to control it all I annoying at times. Do you think this is a worthwhile upgrade? (I'm planning on spending $500-600) Any and all feedback helps, thanks!

[cicopo]

Well the 2n has a few features the 1D2 didn't  including the ability to write jpg's to 1 card & RAW to the other (use a bigger card for the RAW) plus a larger LCD. I still own & use a 2n & had 2 of them for about a year & it's a great body when you're able to fill the frame. Now you have to learn the menu system but at least you won't knock the mode dial to another setting which you missed noticing. 

[Markfinn]

Yeah, that's for sure, more than a couple of shots have been lost due to that mode dial. I'm already reading the manual as you suggested, so maybe I'll be able to do something with it when it comes haha