I had a steak tonight at Santa Fe Steak House in the new mall. It's on the 4th floor not too far from Sizzler. Now that I have had a steak at both Santa Fe and the Sizzler, I'll compare the 2 places for you.
Santa Fe had the option of a T-bone steak from Thailand (250 baht) or a T-bone steak from New Zealand (500 baht). I didn't even bother to consider the Thai meat and ordered a medium rare NZ T-bone. The steak was fine and obviously was imported, however, it was different than a steak from Sizzler in that it was a much thinner cut and I'm sure weighed less.
The same steak at Sizzler costs 2-300 baht more, but It's bigger. The reason why I will eat steak at the Sizzler in the future and not Santa FE is because of what comes with the steak. At Santa Fe, you get a meager salad on the plate with some odd, egg-shaped potato things. At the sizzler, there is a great salad bar which includes your choice of dressings, soups, fruit, dessert etc., all included in the cost of the steak.
I have no idea what you mean when you say you prefer your steak "blue", but Sizzler does carry a red wine.
Another option is to make a steak the way you like it at home. The new Tops Market at Central Plaza carries imported beef. Probably Makro, Big C or Tesco do as well, though I can't personally verify that. It would not surprise me if the Pullman hotel offers a decent steak and/or a Sunday roast. Happy hunting!