From the full list, i will only choose Harvey Norman if im going for imported leather sofa. First, i like up-to-date and minimalist design. Harvey Norman usually have only few sets, good quality and their design ever changing. If you have more budget, may i suggest you check out SPACE at The Intermark. If you are looking at a more affordable range, i suggest Ikea or Maju Home. Sorry to say i never like furnitures from Lorenzo, Cellini or most of those suggested. The designs looked old fashioned to me, and they are always the same all year round and year to year - the only thing is you choose your fabric / leather. If you prefer a more classical or orthodox types, you may try Brunomenzi (sister company of Cellini, though im not sure if it still around)

Dont underestimate Ikea and Maju Home, they have got pretty good quality furnitures, functional and the designs are pretty. Hope this helps !