My experience has been almost exactly the same as yours. I bought Windows 8 and Parallels primarily to run Quicken. The scaling issues with Quicken have been a real pain.
I have just bought a Surface Pro 3 as I support IT in a Windows environment, so I expect I will remove Parallels eventually and install Quicken on the Surface Pro instead.
I found the SP3 to be an awesome machine, I'm shocked at how portable it is. Its like toting around an iPad, but with the power of a laptop. Great computer.
Its slower then my rMBP, but that's somewhat understandable, quad core, faster CPU (GHz wise) and dGPU.