I have a Lenovo T530 for personal use (college laptop) and it had no problem running whatever CAD program I wanted. Mine only has 4 gigs of RAM but I'm pretty sure it was upgradeable to 16. It has been a great laptop, and I definitely became a fan of Lenovo over the last 5 years of owning their laptops.
The only complaint I have with Lenovo is that their GPUs aren't replaceable because they're integral to the motherboard. So for a lot my rendering uses (CPU or GPU intensive depending on rendering engine) my computer would bog down because I wasn't able to upgrade the GPU beyond what came standard. Also, most Lenovos aren't super stylish, they're fairly utilitarian but durable and well built.
I have a HP Elitebook 8560w for work and it's been very good too. Spec'd a bit higher than my Lenovo (8 gigs RAM, faster i7 processor, etc) so it handles the workload a bit easier.