28mm vs 35mm+0.5 lense

[dabidian]

I'm comparing the OLY 5050 and Minolta DiMAGE 7Hi.
Minolta is a bit expensive for my budget.

I really like to be able to take WIDE pics. I understand that Minolta offers 28mm v.s. Olympus 35mm. But I see that one can buy a 0.5x wide angel lens for the Olympus....
Here's my question:

Will you have the same width power, using olympus + 0.5x lense .....as 28mm Minolta...How do u compare them?