Fisker will not be as common as BMW for a very long time, if ever. BMW is a well established company with a broad product offering. The Karma specifically is intended as a niche car, with annual production near 15,000 units, 40-50% of which for US sale.
The closest BMW comparison is probably the 7 series, of which there 5 variants not including the upcoming ActiveHybrid 7. BMW sold 11,299 last year in the US, so even if the Karma reaches full target the big BMWs will still outsell the Karma 2-1.
A better comparison is the Panamera. According to Wikipedia they sold 6188 sold in the US last year, which is right in line with Karma's targets. In other words the Karma would be about as likely to see as a Panamera, and in likely the same geographies. The top two cities for the Panamera in 2011 world-wide were Los Angeles (890) and New York (760). Hong Kong is third with only 300 sales. See http://en.wikipedia.org/wiki/Porsche_Panamera#Sales