View Camera To Dslr Adapter Live View DSLR?

Live View DSLR? - view camera to dslr adapter

As a fashion photographer and commercial advertising in retirement, my team is out of date. I shot 4x5, 2 ¼ to 35 mm.
My camera was Olympus 35mm choice for all my jobs, BM 1, 2 and 4
I have one of the points and Olympus cameras.
I love the live view, I have decided to get a digital SLR camera.
And the Olympus E-510 with Live View, something that I will be back in the days of 35 mm. I have planned a large collection of Olympus lenses and published as a 510 buy the end of June
Most of the people at Canon in the mind.
My question is, why? And the value of the juice is live view of the compression?