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New old stock. Seller of each is Survey Supplies, an arm of C R Kennedy (official Australian distributors of Ricoh-Pentax and Sigma).

Sigma 18-50: Sigma 18 50mm F 2 8 4 5 HSM DC OS ASP AF Lens FOR Pentax 846431003506 | eBay
Reviews: Sigma 18-50mm F2.8-4.5 DC OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database

Sigma 24-70: Sigma EX 24 70mm F 2 8 DG Macro Lens FOR Pentax DSRL Cameras 085126270605 | eBay
Reviews: Sigma 24-70mm F2.8 EX DG Macro Lens Reviews - Sigma Lenses - Pentax Lens Review Database

[rawr]

The same seller also have a Sigma 35 f1.4 'Contemporary' for Pentax listed. It's a very nice lens.

Unfortunately the Sigma 24-70 listed isn't the HSM model. My Tamron 28-75 is safe.

[Des]

Unfortunately the Sigma 24-70 listed isn't the HSM model

Yes, it's the still-hefty 715g predecessor. Highly rated lens though. FF too.