So that you can inform us later of your experience.
• Nothing happened to it. Everything was fine. Others are just paranoid. From now on you will always check in your DSLR.
• It got smashed when the luggage handlers threw the luggage around.
• It was stolen from the luggage by unknown persons.
A related question - do you put your wallet n credit cards in your check in luggage ? Have you considered seperating the lens from the body, placing each in some kinda lightly padded bag and carrying this with lap top in a bigger laptop bag ? Actual given the tight time frames in business travel today I'd be surprise u have time to shoot. Most companies do not allow for extra days even at your cost for hotel N expenses if you are an employee.
u just have to accept the cons of bringing dslr in your trip that u have to carry it with u. anyway it is not so hard to hand carry it as u r sitting all the time in ur flight and while leaving your belongings into the compartment. also in the airport lobby, u can sit most of the time to not feel the pain of carrying dslr. or if u r really clumsy, then go ahead on getting mirrorless camera as they are lighter.
Don't bring your 5D... get a cheap and small compact. Then you can wrap your cam with your clothes and check in your cam... most probably no problem
Anyway... I never check in my DSLR and laptop, I prefer to carry it with me, I got myself a good bag that can put both items in so no problem... but don't ever check in your laptop (with or without your harddisk - although frankly I don't know how you dismantle the harddisk from the computer) bcos harddisk is not the only fragile thing in your laptop - not forgetting your very very large LCD.