No, sine oscillators are very uncommon on analogue subtractive synths (for obvious reasons) and in any case are hard to implement
The A4 has a flexible Triangle which is easily filtered to mostly leave the fundamental freq (like a sine) … it also shape shifts into a better saw than the actual saw imho
The dominant issue with the A4 (and the prime difference to the Mk2) is the ladder filter - it’s not quite transparent enough for some folk at default settings - it does have its own flavour for sure and needs a bit of care in use although the second filter can work wonders on the overall sound
steamy wouldn’t be the term i’d go for but it has an emphasis which imparts a buzziness I suppose, especially with a bit of noise