A lot less impressive when you consider what CPUs the XPS 13 is using
It's still running on 6-year-old architecture at it's core. The highest CPU SKU in the XPS13 I believe uses a Intel Core i7-1065G7 which is a quad core part with low clocks easily beaten by old Zen 2 cores in Ryzen 4000 mobile.
In a month or two we can hopefully compare the M1 to Ryzen 5000 mobile and that will be the most relevant comparison for the upcoming year IMO. It doesn't look like Intel is going to be competitive again until 2022 at the earliest.