How much difference between i5 and i7 13" Macbook Pro 2014 especially for programmer?

I have been trying to decide if there will be a substantial difference between the i5 and i7 processor for compiling and running VMs. I expect to run Windows with Visual Studio in a VM as well as a lot of XCode.

I looked at the Geekbench3 and pulled out the following figures from the averaged charts at Primate labs comparing the two Macbooks against my current desktop.

Benchmark           13” i5 2.8 GHz      13” i7 3.0 GHz      iMac 2.5Ghz i5 21” Mid-2011

64 bit multi-core    6880                7209                 10073

64 bit single-core   3294                3466                  2663

32 bit multi-core    6151                6373                  7103

32 bit single-core   3131                2971                  2466

XCode can compile using multiple cores as can Visual Studio (at least if I boot with Bootcamp, not sure if will work under a VM).

Note that a common mistake is for people to think the i7 in the 13" Macbooks is a 4 core - it's not - both the i5 and i7 in 13" Macbooks are dual-core. The difference is the i7 adds hyperthreading. (The 15" i7 model is quad core.)

The other difference that may be very significant is the 3MB vs 4MB cache.