Gonna answer my own question here.
Was able to get a hold of 1540 pads locally (from Australia) and was very excited to put them on as i found the comfortability on the stock pads as severely lacking.
Now i absolutely love the stock sound. Fast planar sound, fast bass (abiet me wanting just a touch more) and fairly balanced to my ears.
Unfortunately for me the 1540 pads changed to sound signature to much for me. It made it sound a bit too dark for me. Now The bass became a touch too more for my ears and ever so slightly looser. Treble also seemed a bit more grainier. Basically everything seemed a lot more closed in/muffled to my ears.
There is no doubting the comfortability of the Alcantera, they are ear pillows but to me i don't think the trade off is worth it. I missed/craved the stock sound that much. I missed the imaging and the much tighter sound (being my first planar).
I went back to the stock pads and put some toilet paper under the pads to try and get a bit more comfort (as they raise the pads up a bit more). Still nowhere near the comfort of the 1540s though.
Anyways that's just my opinion and i know a lot of people here are waiting for their pads but i thought i would share. Of course YMMV.
I noticed in one of the comments on Z's T50rp mk3 video that they felt the same that i did and what they did was decide to cut open the felt insides of the 1540 pads to expose the driver. They found that this managed to get the stock sound back.
Here is his photo
However i am definitely apprahensive doing this as these pads were not freaking cheap.