I don't know concerning bussiness market, but I'll give you my experience with consumer laptops.
Before I attended highschool this year, I went looking for a laptop. I went to A LOT of stores mainly in Brussels (Belgium). I didn't see a single lenovo. They all seem obsessed by the crap called packard bell and acer. There also are a lot of hp, toshiba and sony (and apple). I had, although never used before, a preference for thinkpads, but just went comparing the available models in the stores. The sony FE21B seemed ok and it felt quite strong. It dissapeared from the store I was going to buy it from and although it was still available at sony center (with only 1 year garantie), I went looking for something else. I decided to drop by 2 small computer stores in the neigbourhood where I got the offer for a R60 at 1400 euro. I quickly ordered one and was happy to notice I had the last one in stock.
I'm now studying informatics at highschool and I thought there would be a lot of ibm/lenovo-fans, but no, even there everyone seems to be obsessed by mainly acer and dell. When I had my thinkpad with me for the first time someone even thought it would be a PII or something

.
Make a long story short: finding a lenovo (in Belgium) without explicite looking for it is impossible.
About dell >< lenovo:
I've a friend that has a new d420, similar specs as me. I must say it looks better buildt then other dells I've seen. The dell even has a trackpoint, which I didn't test, but it seemed less handy and there's no middle mouse (which I really like). On the dell site there's advertised 6 hours on battery (6-cell), my friend gets 3. (compared with mine: specs say 3 hours, I get 3h40 using my custom made power sheme)
The D420 also has a widescreen and although I wanted one first too (the sony had one), I'm really SO glad I have just a 4:3. Mainly because the amount of pixels is a lot higher.
The d420 also misses things like active harddrive protection, fingerprint reader (however optional if I'm right), decent software (like thinkvantage),....
To conclude: I think dells are taking over some ibm/lenovo things and are getting better, but it is not (yet) as good as a thinkpad.
About lenovo design:
I thought of a lenovo branded laptop myself for a moment but when I saw pictures of it I found it looking like hp/acer.
It for example is rounded at the back, while I just want to things be sharp-edged.