The ThinkPad X1 Carbon has a better storage medium than most medium processor core laptops that have been available for a similar time to it. This notebook PC has an SSD storage medium, whereas most medium processor core laptops that came out around the same time as it have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
An SSD storage medium is in fact the best storage medium across all notebook PCs of a comparable spec and age to the ThinkPad X1 Carbon.
An HDD storage medium is the worst storage medium across similar types of notebook PC.
Other notebook PCs that have an SSD storage media currently available which you might want to look at include cheaper notebook PCs such as the EliteBook 820, or the ZBook 15 both from HP or the DELL Latitude 14 5404.