I always suggest not to focus on leathers tanned in China. They are not inferior in any way, shape or form. In fact, they are remarkably consistent, which is a good thing as you can add a chair or ottoman a year later and not see a tremendous color shift in the new piece from the older ones. Leathers from Italy and South America vary wildly in comparison, with wide swings in quality and color consistency.
Leggett and Platt is the world's largest recliner mechanism maker for example, and one of the highest quality ones. They have two USA-plants and also two in China. What they output from both is identical in quality. I have a few clients from time to time that insist they only want the L&P Mech with a "made in USA" sticker on it. Read into this thread from 2010 to see their VP's reply to me on this topic:
http://www.myfurnitureforum.com/show...-made-in-China. Of course, you can say you don't trust what he says and that becomes a different issue, or say you don't want to support the Chinese economy at all and that also is a separate issue. However the fact of the matter is this is world economy, like it or not, and the smart phone you have in your hand as well as the tablet, laptop or computer is almost certainly made in China. Your TV is either China or Korea production.
Companies do not have unique leathers. That is Omnia - for example - doesn't have leathers made just for them, they source from suppliers. There are two big leather show to the trade in June and December of each year in High Point NC where the furniture makers go and pick out next season's leathers from hundreds of leather suppliers. These shows are four months before the Furniture Market, so they have time to buy new hides and use them to show to Dealers at the Market shows in April and October. This is where furniture makers select hides for their lines and they try to cover the spectrum from low cost to luxury hides to try to reach across the consumer financial spectrum. I see the same exact leather pop up in all our suppliers, with a different name assigned to it from each furniture maker. They all put it in their lines if its a good hide that meets their target needs. I don't know Omnia - it's a California company (I was just 2 hours from their manufacturing facility this weekend), but I would bet you a dime to a dollar that if you put their leather handle samples in front of me I could identify several series as coming from Chinese tanneries, because I know what to look for.
If you really want the insider's tip on things, my opinion is that where the leather is tanned is of no importance whatsoever. What matters a hundred times more is regular cleaning & conditioning, and keeping the piece out of direct sunlight. You can take the world's finest hides and if you don't keep them maintained and let the UV rays eat them up, they won't fare as well as the least expensive promotional leather that has been taken care of. Generally European hides are more exotic and luxurious, and those from Pacific Rim countries are more mainstream. If you don't take care of them, they will all soil and crack-out / split.