SMC/S-T 35/2.0 is a quite good wide angle. The 35/3.5 looks like a cheap "beginner" lens and is not nearly as good.
I am a bit surprised by your evaluation here. Have you used a SMCT 35/3.5 in your comparison? I find the K 35/3.5 (supposedly identical to the SMCT 35/3.5) superior to the K35/2 (supposedly identical to the SMCT 35/2) as far as flare and resolution are concerned.
There are two S-T 35/2. The big one with 67mm filter size is said to have high resolution but also more flare than smaller 35/2, probably because of its big front element (from JCO and a japanese site). But in any circumstances, as you noted, SMCT are a better choice.
Andre
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