In the entire month of February of 2014 (4 weeks) the Xbox One sold 259k units. In the first two weeks of February of 2021, the Series X and S have sold 220k units. Xbox Series is on track to sell around 450k units in February of 2021, which would be almost double what the Xbox One sold in 2014.
Series is only slightly ahead for now because they had supply issues in November and December - when Xbox One was ahead - , but in January and in February, Series has been selling 60-80% more every week.
You can see this in the latest weekly data, this is the sales data after the Holiday season (January and February, Series X and S versus One):
Week 8 - 187k vs 79k
Week 9 - 106k vs 64k
Week 10 - 88k vs 61k
Week 11 - 97k vs 61k
Week 12 - 100k vs 64k (Series X and S surpassed Xbox One here)
Week 13 - 105k vs 66k
Week 14 - 114k vs 66k
In Week 15, Xbox One sold 62k units. Series should sell anywhere from 90k to 120k depending on stock availability. It seems supply is improving. Seems Microsoft is now consistently sending over 95k units every week.