Here's someone doing an acceleration test between the C43 AMG and Kia Stinger GT. The one thing Mercedes has on the Stinger is AWd and even then the C43 isn't quicker by all that much, staying around 6 or 7 mph ahead of the Stinger GT. In some points that gap is reduced to around 1-2 mph. May as well go for the more affordable option that around $10k less.