As you are looking at an ULTRA gaming build that can handle high FPS, especially 144Hz and 1080P 144Hz is great, then for the best all out FPS, the 9700K or 9900K though you can't really go wrong on the AMD side but that would be better for 1440p as things even out more at that resolution. On the GPU side the RTX 2080 Super is just a powerhouse.
Below are a couple of examples just to show you what Ultra can be...Others I am sure can refine but at least you have an idea at the top end. Prices can be dropped by a good $200 to $300 by changing some components to more cost effective options and some fine tuning!
Example Intel - 9700K plus RTX 2080 Super - Fast Gaming CPU, Fast DDR4 3600 RAM, NVME SSD 1TB - Very good PSU
PCPartPicker Part List:
https://pcpartpicker.com/list/Grdwtg
CPU: Intel Core i7-9700K 3.6 GHz 8-Core Processor ($349.99 @ Amazon)
CPU Cooler: Cooler Master MasterLiquid ML240L RGB 66.7 CFM Liquid CPU Cooler ($65.89 @ OutletPC)
Motherboard: Gigabyte Z390 AORUS PRO WIFI ATX LGA1151 Motherboard ($179.99 @ Amazon)
Memory: G.Skill Ripjaws V 32 GB (2 x 16 GB) DDR4-3600 Memory ($149.99 @ Newegg)
Storage: Crucial P1 1 TB M.2-2280 NVME Solid State Drive ($99.85 @ OutletPC)
Storage: Western Digital Caviar Blue 1 TB 3.5" 7200RPM Internal Hard Drive ($42.99 @ Newegg)
Video Card: EVGA GeForce RTX 2080 SUPER 8 GB XC ULTRA GAMING Video Card ($689.99 @ Newegg)
Case: Fractal Design Meshify C ATX Mid Tower Case ($104.98 @ Newegg)
Power Supply: SeaSonic FOCUS Gold 750 W 80+ Gold Certified Semi-modular ATX Power Supply ($101.00 @ Amazon)
Total: $1784.67
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-09-09 17:48 EDT-0400
Example AMD - Ryzen 5 3600X and RTX 2080 Super
CPU: AMD Ryzen 7 3700X 3.6 GHz 8-Core Processor ($327.89 @ B&H)
Motherboard: Gigabyte X570 AORUS ELITE ATX AM4 Motherboard ($199.99 @ Newegg Business)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3200 Memory ($79.99 @ Amazon)
Storage: Crucial P1 1 TB M.2-2280 NVME Solid State Drive ($99.85 @ OutletPC)
Storage: Western Digital Caviar Blue 1 TB 3.5" 7200RPM Internal Hard Drive ($42.99 @ Newegg)
Video Card: EVGA GeForce RTX 2080 SUPER 8 GB XC ULTRA GAMING Video Card ($689.99 @ Newegg)
Case: Fractal Design Meshify C ATX Mid Tower Case ($104.98 @ Newegg)
Power Supply: SeaSonic FOCUS Gold 750 W 80+ Gold Certified Semi-modular ATX Power Supply ($101.00 @ Amazon)
Total: $1646.68
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-09-09 17:53 EDT-0400