Not really. I would consider firms like Accenture, Mercer, Oliver Wyman etc. as more Tier 2.
The big 4 are big in terms of headcount and the no. of 3rd party services they sell, but in terms of prestige and remuneration it's more like Tier 3.
The fact that the former big 5 Arthur Andersen spin off its most lucrative and branded business into Accenture and merge its other remaining bits and pieces into the current big4 tells you much.
Agreed, Big 4 are not even known for their consulting services.
Firms like ACN, Booz and Co, Mercer and Oliver Wyman are the true Tier 2 companies.
