Will an article about my company look different to readers if it’s been disclosed that the author has a conflict of interest?

No. The article looks exactly the same. An experienced Wikipedia user might check the Talk page of the article where the COI should be disclosed or check the user profile of the author/editors, where COI should also be disclosed. If the article has been handled correctly, there will also be a record that it and/or any changes have been reviewed by an experienced editor, who has approved of the content as abiding by all Wikipedia policies despite the COI.