There are dingys and there are dingys and ditto survival suits
Be aware that your dinghy should be a North Atlantic dinghy with an insulated floor (to provide some protection from freezing cold sea) NOT YOUR RAFT FOR LE TOUQUET !
Also I have been advised that not all survival suits are the same so make sure you have an arctic survival suit.
Your odds on surviving a ditching will be a tad improved but still not great !