I have a couple of Hasegawa Zeros and they're not much better than the ancient Tamiya that I built. The new Tamiya Zeros have come out in the last five years and are real gems. There is an A6M3 and A6M5 in 1/48 and an A6M2 and A6M5 in 1/32 (which came out earlier - about 2000). You can tell the old ones from the new ones by the price - the old 1/48s are about $15 and the new ones $40. The new 1/32s are above $100 - although the Zeros, being first, are lesser in cost. All of the new generation of 1/32s from Tamiya - (P-51, Spitfire, Corsair and Mosquito) have received crazy-good reviews. Doog just did the Corsair and said it was the best kit he'd seen. Space would keep me from going to 1/32 (a good scale for WWI). And I've probably got 30 1/48 fighters and several 1/72 four-engined planes - very good kits all.
Not that Hasegawa doesn't make good kits. They better - next up is the Revell Germany rebox of the Hasegawa Spit IX/XVI.
Eric