Are you talking about comparing items that you have equipped vs the item you want to buy?
You can do that now. If you are at a vendor with a cursor on an item hold R2 and it will compre that item with your currently equipped item.
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Yes, that's a good feature. When I say "compare," though, I mean flipping between the details screens of two adjacent items at the vendor.
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Ok, I see what your saying. That would be helpful as well.