What is the best process using k2000 to sysprep and deploy a Windows 8.1 EFI computer?
UEFI typically creates several additional hidden partitions that store the boot information. You will need to un-hide these using diskpart before you capture the image. You will want to capture all of them.
When setting up your pre-install task sequence, the K2000 has a couple of built in pre- and post- installation tasks for UEFI. You might try starting with those to see if they work to deploy your sysprep'd vanilla install.
I ended up creating my own, as the built in only creates 3 partitions. I wanted 4 so I could have the Windows recovery tools onboard, and also have a Push Button Recovery Image. Here is a link to a good TechNet article that I used to create my tasks for creating and applying the partitions:
The technet article is good information, may want to also see the following links which can tie in the tasks/commands and how they are used for the K2000 image deployment.