I managed to try the 1A with my TG334 on Toxic Hydra cable quite extensively some time back.
There was no hiss. Matching wise, as much as it sounded very nice, it wasn't a perfect match for me personally; due to both the TG334 & 1A both having slightly meaty tonality. Vocals is simply beautiful and treble is uber smooth, but the bass is a tad too loose.
Pricing wise, I thought Sony got it quite right with the 1A. The 1A is $200 cheaper than the TG334.