If I needed such a camera I assume I would have a business and making money from photography.
At that point it is far better to lease or rent the camera because of tax laws here. 80% of the lease cost can be written off (reduce your income by the 80% of your lease / rental cost). If you buy you can only claim depreciation which is about 3% of the purchase price a year.
If you are earning money from photography, even paying more on a lease over buying costs less because you end up not giving as much to the government in taxes