Need to correct this, and misconception by many, Sony is not new in the market:
1. Sony has been making dslr sensors since the beginning of the dslr era.
2. Sony took over Minolta SLR/DSLR team of engineers and technology. Sony basically re-branded and improves some of the existing lense and camera. That why you can still use old Minolta A-Mount lense.
3. Minolta existed almost as long as Nikon and Canon to make SLR.
Minor quibble... I think one should not say Sony is not new to the DSLR market. I think they are new to the market, since they have little or next to no market research or R&D nor a department for DSLRs before they bought over KM. I think we should say that SONY did not start from scratch in the DSLR market even though they were new to the market... they had the expertise of the KM engineers to tap on for their Alpha line.