The Volkswagen Group unit reported a 32 percent surge in sales in the first half to 3,929 vehicles. In August, the company forecast second-half deliveries higher than the first six months on demand for its entry-level coupe.
"The ultra-luxury auto market is stable at the moment, but not growing in a way people predicted a year ago," said Kevin Rose, head of sales and marketing at Bentley, VW's British ultra-luxury marque.
The sovereign-debt crisis, which is prompting Spain, Greece and Italy to push through austerity programs, has caused a slowdown that has spread to other European countries.
The U.K. economy shrank 0.4 percent in the second quarter, while unemployment in Germany climbed for a sixth straight month in September.
The European Union's car market is poised to fall 7 percent this year, the fifth straight annual decline and the lowest level since 1995, according to auto industry group ACEA.
"Generally, the global ultra-luxury car market is more resilient than the volume segment, but in extreme crisis it also gets affected," said Arndt Ellinghorst, a London-based analyst with Credit Suisse Group AG. "The ultra-luxury carmakers will profit in the next years from growth in emerging markets, which they started to develop only in the last five years."
Faster cars, slowing growth
Slower sales come as competition at the top end of the auto market intensifies.
At the Paris show, Daimler's Mercedes-Benz introduced an electric version of the SLS gull-wing sportster, which will be the brand's most expensive model ever with a price tag of 416,500 euros.
McLaren Automotive debuted the P1 supercar, the successor to the F1, which was the fastest road car in the world in 1998.
Bentley looked to polish its image by presenting a race car concept as part of its plan to return to motor sports and challenge Ferrari. More competition is on the way.
BMW plans to roll out the i8 hybrid sportster in 2014, a year after Porsche introduces the 918 Spyder, an $845,000 limited-run plug-in hybrid supercar.
Porsche last week said that it will build fewer than the 155,000 cars and SUVs originally planned for next year.
Citing deteriorating business in Europe, Daimler last week said operating profit at its Mercedes cars division will fall this year, lowering a previous target of steady earnings.
Still, the segment is far from in free fall. Demand from China and the U.S. will help Ferrari report near record profit and sales levels this year, Chairman Luca Cordero di Montezemolo said in a Paris interview.
"Our key markets -- Germany and the U.K. -- are doing well, Italy not, of course," Montezemolo said. "We have to push" in the U.S., Asia and the Middle East, where demand is still strong.
Lamborghini's Winkelmann is still upbeat about prospects as most markets outside of Europe are stable.
Also, the segment is very much driven by new models, which can in turn spark interesting for the entire segment.
"There's more light than shadow," he said.