Business class seats are configured 2-2.
Seat pitch (rough estimate) is about 45".
Seats have footrest.
I suggest you search
www.airliners.net or
www.jetphotos.net for the cabin pics if you are interested.
FYI, SilkAir has very cheap special fares ex-SIN in business class this month. Check with your travel agent & SilkAir's website.
For example, SIN-FOC/XMN discounted C class only about USD600. Full fare is more than double that I believe.
Warning: mediocre inflight entertainment. Bring your own books/magazines.